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I know no one is gonna read this, so just reply DNR to bump and rep me. This took hours, bro
The Scientific Guide To Losing Weight While Keeping Muscle
(What Works And What Doesn't)
The figure below shows the average person who didn't follow my advice and just spammed. "DNR"
Introduction
We can all relate to the idea that there is far too much bloat in weight loss literature. From "keto", or "using fat as fuel," to "GLP-1s" and "Starve-maxxing," it becomes increasingly difficult to find actual science-backed methods that point-blank WORK. This thread aims to explore the literature surrounding fat loss and find which method maintains the highest percentage of lean body mass. This might go slightly more In-depth than other articles, so to some it's water, to others it's too hard to understand. My goal for the comprehension of this thread is ultimately to make it easy to understand for everyone. Below this, I'll link to another thread that will help explain some of these terms for everyone to understand.
Recommended Reading:
Definitions
The Science Of Weight-Loss
Section 1: What IS Weight Loss
Wikipedia.com lists Weight loss as "A reduction in total body mass caused by a loss of fluid, body fat, or lean muscle tissue." The section we are going to be specifically exploring in this thread is "body fat" (subcutaneous and visceral) and "Lean muscle tissue". The ultimate goal is to lose as much Body fat as possible while preserving or possibly Increasing Lean body mass.
Section 2: What Methods Don't Work
The number of methods shared online is astronomical, leading most to be completely false. Below, I'll list each one that doesn't work, a source, and a reason why they should be entirely ruled out for our goal.
SWEAT-INDUCING PRACTICES/SPOT FAT REDUCTION
While it is true that this can lead to EXTREMELY short-term results, all of this extra weight lost only comes from water. A study by Western Kentucky University concluded that "These results suggest that body fat percentage is not related to sweat volume during exercise." (https://digitalcommons.wku.edu/ijesab/vol11/iss1/21/)
CRASH DIETS/STARVATION/STARVEMAXXING
Severely slashing calories causes your resting metabolism to slow down due to hormonal and thyroid adaptation, affecting energy expenditure at a cellular level due to Mitochondrial ROS, even contributing to enhanced aging (determined in a 2009 study headed by Michael P Murphy), as well as total body weight lost, making weight regain extremely common. Very low-calorie diets cause you to lose precious muscle mass instead of just fat. Completely avoiding the goal of maintaining muscle mass. This 2018 study by the CMU dep. of Nutrition shows a decrease of LBM by almost 33.5% when compared to the Lost BM percentage.
(Relevant figure on the far left)
(https://pubmed.ncbi.nlm.nih.gov/30513859/#&gid=article-figures&pid=figure-1-uid-0)
While these risks shown can be mitigated by high protein intake, getting proper protein is increasingly difficult as you cut more calories. leading to these types of diets being extremely dangerous for a multitude of reasons.
EXTREME EXERCISE/EXTREME CARDIO
While there is some truth behind the fact that cardio and exercise are extremely beneficial for keeping lean mass and losing weight, there's also a caveat to that due to the many health risks and atrophic and catabolic side effects of excessive exercise. One of those many Health issues raised is a condition known as Rhabdomyolysis. Rhabdomyolysis or ("rhabdo") is a serious, potentially life-threatening medical condition involving the rapid breakdown of damaged skeletal muscle. This destruction releases toxic muscle cell contents, such as the protein myoglobin and electrolytes, into the bloodstream, which can severely damage the kidneys and cause dangerous heart rhythm irregularities. Another effect it can have is draining vital energy stores, starving the tissue of its preferred fuel, which causes further cellular impairment.
https://www.healthline.com/health/signs-of-overtraining
https://www.uclahealth.org/news/article/no-pain-no-gain-training-too-hard-can-have-serious-health
Section 3: Ineffective Methods
Below are some listed methods that, while they do produce weight loss, have many issues with them and are therefore irrelevant for our ultimate goal of losing weight long-term while maintaining LBM and healthy endocrine function.
KETO/KETOSIS
The keto diet can produce weight loss, especially in the short term, but many researchers consider it less effective long-term than it first appears because:
A lot of the early weight loss is water weight from depleted glycogen stores due to reduced carbohydrate intake.
As well as long-term weight-loss differences compared with other calorie-controlled diets are usually minuscule.
A major review in The New England Journal of Medicine noted that low-carb diets often produce faster short-term loss, but after about 12 months, the advantage compared to other diets becomes much smaller.
https://www.sciencedirect.com/science/article/pii/S0002916523294125
https://pubmed.ncbi.nlm.nih.gov/23651522/
INTERMITTENT FASTING
Intermittent fasting can reduce calorie intake and help some people lose weight, but many studies show it is not dramatically better than standard calorie restriction when calories are matched. Pairing that with possibly harmful effects of micronutrient depletion, it can have serious repercussions for Insulin, testosterone/estrogen, cortisol, and other thyroid and peptide hormones, cholesterol, and other endocrinological hormones.
https://nutritionsource.hsph.harvard.edu/intermittent-fasting
https://pmc.ncbi.nlm.nih.gov/articles/PMC8419605
https://pubmed.ncbi.nlm.nih.gov/29778565
Section 4: Addressing Weight-loss drugs
GLP-1 AGONISTS
GLP-1 stands for “Glucagon-Like Peptide-1,” an incretin hormone naturally released in the intestines after food consumption. Under normal physiological conditions, GLP-1 helps regulate blood glucose levels and appetite by signaling satiety to the brain and stimulating insulin release.
GLP-1 receptor agonists mimic and amplify this natural signaling process. By activating GLP-1 receptors within the brain, pancreas, and gastrointestinal tract, these drugs reduce hunger perception, increase feelings of fullness, and slow gastric emptying. This causes food to remain in the stomach longer, reducing overall caloric intake.
Unlike stimulant-based weight-loss compounds, GLP-1 agonists do not primarily function by massively increasing metabolic rate. Instead, the majority of weight loss occurs because total energy intake decreases substantially over time due to appetite suppression and improved satiety signaling.
GLP-1 agonists or Weight-loss drugs such as Retatrutide, Ozempic, Wegovy, and Mounjaro Are Not really in the same category as fad diets or detoxes. GLP-1 medications are considered genuinely effective for weight loss by mainstream medical research.
Clinical trials show people often lose around 10–15% of body weight with semaglutide, sometimes 20%+ with tirzepatide
which is far more than most diets alone. They also improve things like blood sugar and sometimes cardiovascular risk.
But there are two ways they overlap with the “effective but ineffective” idea:
Many people regain weight after stopping
Studies show that when people discontinue GLP-1 drugs, a significant amount of weight often returns over time because: appetite suppression goes away, hunger hormones and eating behaviors return closer to baseline
So researchers increasingly view them more like long-term treatment than a temporary cure.
That means: while taking them, they're usually very effective, however...
After stopping, weight regain is common unless lifestyle changes are maintained
A substantial percentage of lost weight may include lean body mass. Additionally, many individuals experience nausea, vomiting, gastrointestinal discomfort, fatigue, and appetite dysregulation while using these compounds.
There are also more direct concerns and studies regarding lean body mass loss during aggressive GLP-1-induced weight reduction. Because muscle tissue itself plays an important role in insulin sensitivity, glucose metabolism, and endocrine health, significant muscle loss may negatively affect long-term metabolic function if resistance training and adequate protein intake are neglected.
Long-term endocrine and metabolic effects also remain an active area of research. While current evidence suggests GLP-1 agonists are highly effective for weight reduction and blood glucose control, there are still limited long-term longitudinal studies regarding lifetime use, long-term endocrine adaptation, and sustained maintenance after discontinuation.
https://www.nejm.org/doi/full/10.1056/NEJMoa2032183
https://pmc.ncbi.nlm.nih.gov/articles/PMC9542252
https://www.nejm.org/doi/full/10.1056/NEJMoa2206038
MITOCHONDRIAL UNCOUPLERS
Mitochondrial uncoupling is one of the few weight-loss mechanisms that genuinely increases energy expenditure at the cellular level. Unlike fad diets, sweat-inducing practices, or detoxes, uncoupling directly alters how the body produces and utilizes energy.
Normally, the mitochondria convert nutrients into usable cellular energy known as ATP (adenosine triphosphate).
Under normal physiological conditions, most energy extracted from nutrients is efficiently converted into ATP, while a smaller amount is released as heat/energy.
Mitochondrial uncoupling disrupts this process by reducing the efficiency of ATP production, forcing the body to waste a greater percentage of energy as heat instead of storing or utilizing it efficiently. This causes the body to burn significantly more calories in an attempt to maintain adequate cellular energy production. Because of this mechanism, uncoupling can dramatically increase metabolic rate, thermogenesis, and fat oxidation.
However, artificial mitochondrial uncoupling through chemical agents carries severe physiological risks.
https://en.wikipedia.org/wiki/2,4-Dinitrophenol
2,4-Dinitrophenol (DNP) is the most well-known example of a mitochondrial uncoupler historically used for rapid weight loss. While it is undeniably effective at increasing caloric expenditure and fat loss, it does so by forcing mitochondria into an extremely inefficient state, causing large amounts of energy to be released as heat.
Unlike traditional dieting, where caloric expenditure increases gradually, chemical uncouplers can overwhelm the body's thermoregulatory systems. This may result in hyperthermia, dehydration, cardiovascular stress, ATP depletion, organ failure, and death. One of the major dangers of mitochondrial uncouplers is the extremely narrow margin between an “effective” dose and a lethal dose.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5609622
https://pmc.ncbi.nlm.nih.gov/articles/PMC3550200
https://www.nature.com/articles/nrd4466
FOOTNOTE!!!:
There aren't enough clinical trials and studies on the long term effects of GLP-1 Agonists and Mitochondrial Uncouplers. With that in mind, I cannot reasonably recommend this to anyone due to safety reasons.
Section 5: What Does Work?
So Far we've managed to cover several different methods and disprove them. However, what methods DO actually work and why?
After decades of nutritional and exercise science research, the literature overwhelmingly points toward three primary factors for sustainable fat loss while preserving lean body mass: a moderate caloric deficit, adequate protein intake, and resistance training. Unlike fad diets or aggressive starvation protocols, these methods consistently demonstrate superior long-term body composition outcomes while minimizing muscle loss.
CALORIC DEFICIT + HIGH PROTEIN + RESISTANCE TRAINING
Caloric deficit:
The body loses fat when energy expenditure exceeds energy intake. Most evidence supports moderate deficits as significantly more sustainable and muscle-sparing than crash dieting or starvation-based methods. Instead of forcing the body into extreme deprivation, a moderate deficit allows fat stores to be utilized while reducing the amount of lean tissue lost during the process.
https://pmc.ncbi.nlm.nih.gov/articles/PMC8017325/
https://pubmed.ncbi.nlm.nih.gov/18025815/
https://www.mayoclinic.org/healthy-lifestyle/weight-loss/in-depth/calories/art-20048065
https://pmc.ncbi.nlm.nih.gov/articles/PMC9036397/
HIGH PROTEIN INTAKE:
High protein intake plays a major role in preserving lean body mass during weight loss. Protein intake is consistently shown throughout the literature to be one of the strongest predictors of muscle retention while dieting. Higher protein diets improve satiety, increase thermogenesis, support recovery from exercise, and reduce the amount of lean tissue lost during caloric restriction.
Research surrounding physique athletes and resistance-trained individuals frequently suggests protein intakes around 1.6–2.2 grams per kilogram of bodyweight per day during fat-loss phases. This becomes especially important during aggressive cuts, where the body is at a greater risk of breaking down muscle tissue for energy.
https://jissn.biomedcentral.com/articles/10.1186/1550-2783-11-20
https://pmc.ncbi.nlm.nih.gov/articles/PMC10974928/
https://nutritionsource.hsph.harvard.edu/what-should-you-eat/protein
RESISTANCE TRAINING:
Resistance training provides the primary anabolic signal that tells the body to preserve muscle tissue during a caloric deficit. Without resistance training, a much larger percentage of weight lost tends to come from lean mass rather than fat tissue. Studies consistently show that individuals who combine resistance training with adequate protein intake maintain significantly more muscle while dieting compared to dieting alone.
Resistance training also improves insulin sensitivity, metabolic health, physical performance, and long-term body composition outcomes. Rather than simply lowering body weight on a scale, resistance training shifts the focus toward improving body composition by maximizing fat loss while minimizing muscular atrophy.
https://pmc.ncbi.nlm.nih.gov/articles/PMC8365736/
https://pmc.ncbi.nlm.nih.gov/articles/PMC12851882/
https://blog.nasm.org/resistance-training-for-weight-loss
TAPERED WEIGHT-LOSS
My personal favorite and effective form of losing weight, ESPECIALLY in individuals with a larger Fat-mass percentage.
In the figures above, it is shown that the weight will end up hitting a wall due to BMR colliding with the deficit marker.
This method addresses and fixes that issue
While the body loses weight, it undergoes a few processes known as: Gluconeogenesis, Lipolysis, and Catabolism. To dumb it down, these processes help your body use untapped areas for Energy such as smooth muscle, Bones, and in most cases (especially in subjects with higher body fat concentrations), both Visceral and Subcutaneous fat.
Now, due to the body not really caring what it takes from during that catabolic state, Subjects with higher Fat Mass concentration Will experience significantly less bone wasting and muscular atrophy from this catabolic state.
Due to individuals with higher BFC experiencing less overall LBM reduction, it is commonly found that these individuals can afford a greater deficit and overall higher fat loss compared to LBM percentage reduction.
A Model following this structure would go as follows:
(for male subjects ONLY)
40% body fat could potentially lose 4-5lbs a week without significant atrophy
35% body fat could potentially lose 3-3.5lbs a week without significant atrophy
30% = 2.5-3lbs a week
25% = 2-2.5lbs
20=1.5lbs
15=0.5-1lbs
10%=0.5
Jordan=PSL
Chico=Appeal
Nobody is gonna read this shit, bro jfl
(For female subjects ONLY)
STRUCTURED IN PERCENTAGE OF TOTAL BW PER WEEK NOT LBS
(Individuals with severe obesity may sometimes tolerate higher rates temporarily under supervision)
45%+ = 1–1.5% PW
40% = 1–1.25% PW
35% = 0.8–1% PW
30% = 0.7–1% PW
25% = 0.5–0.8% PW
20% = 0.25–0.5% PW
https://www.nature.com/articles/0803483
https://pubmed.ncbi.nlm.nih.gov/22258266
https://link.springer.com/article/10.1186/1550-2783-11-20
https://pubmed.ncbi.nlm.nih.gov/21558571
https://pmc.ncbi.nlm.nih.gov/articles/PMC3673773
Section 6: Closing Statements
While I do think it is entirely possible to be able to preserve FFM and LBM with some of the other methods i think the two listed above are by far superior, safer, and easier to approach than the others I listed in the separate section. If you actually read this, holy shit Thank you. This took me like 3.5 hours, not accounting for the research.
This entire paper is, to the best of my knowledge, entirely accurate with clear sources and explanations. If there is anything that needs to be altered, PM me and I'd be happy to consider it.
The figure below shows the guy who followed my advice and read this
So researchers increasingly view them more like long-term treatment than a temporary cure.
That means: while taking them, they're usually very effective, however...
After stopping, weight regain is common unless lifestyle changes are maintained
A substantial percentage of lost weight may include lean body mass. Additionally, many individuals experience nausea, vomiting, gastrointestinal discomfort, fatigue, and appetite dysregulation while using these compounds.
There are also more direct concerns and studies regarding lean body mass loss during aggressive GLP-1-induced weight reduction. Because muscle tissue itself plays an important role in insulin sensitivity, glucose metabolism, and endocrine health, significant muscle loss may negatively affect long-term metabolic function if resistance training and adequate protein intake are neglected.
Long-term endocrine and metabolic effects also remain an active area of research. While current evidence suggests GLP-1 agonists are highly effective for weight reduction and blood glucose control, there are still limited long-term longitudinal studies regarding lifetime use, long-term endocrine adaptation, and sustained maintenance after discontinuation.
https://www.nejm.org/doi/full/10.1056/NEJMoa2032183
https://pmc.ncbi.nlm.nih.gov/articles/PMC9542252
https://www.nejm.org/doi/full/10.1056/NEJMoa2206038
MITOCHONDRIAL UNCOUPLERS
Mitochondrial uncoupling is one of the few weight-loss mechanisms that genuinely increases energy expenditure at the cellular level. Unlike fad diets, sweat-inducing practices, or detoxes, uncoupling directly alters how the body produces and utilizes energy.
Normally, the mitochondria convert nutrients into usable cellular energy known as ATP (adenosine triphosphate).
Under normal physiological conditions, most energy extracted from nutrients is efficiently converted into ATP, while a smaller amount is released as heat/energy.
Mitochondrial uncoupling disrupts this process by reducing the efficiency of ATP production, forcing the body to waste a greater percentage of energy as heat instead of storing or utilizing it efficiently. This causes the body to burn significantly more calories in an attempt to maintain adequate cellular energy production. Because of this mechanism, uncoupling can dramatically increase metabolic rate, thermogenesis, and fat oxidation.
However, artificial mitochondrial uncoupling through chemical agents carries severe physiological risks.
https://en.wikipedia.org/wiki/2,4-Dinitrophenol
2,4-Dinitrophenol (DNP) is the most well-known example of a mitochondrial uncoupler historically used for rapid weight loss. While it is undeniably effective at increasing caloric expenditure and fat loss, it does so by forcing mitochondria into an extremely inefficient state, causing large amounts of energy to be released as heat.
Unlike traditional dieting, where caloric expenditure increases gradually, chemical uncouplers can overwhelm the body's thermoregulatory systems. This may result in hyperthermia, dehydration, cardiovascular stress, ATP depletion, organ failure, and death. One of the major dangers of mitochondrial uncouplers is the extremely narrow margin between an “effective” dose and a lethal dose.
https://pmc.ncbi.nlm.nih.gov/articles/PMC5609622
https://pmc.ncbi.nlm.nih.gov/articles/PMC3550200
https://www.nature.com/articles/nrd4466
FOOTNOTE!!!:
There aren't enough clinical trials and studies on the long term effects of GLP-1 Agonists and Mitochondrial Uncouplers. With that in mind, I cannot reasonably recommend this to anyone due to safety reasons.
Section 5: What Does Work?
So Far we've managed to cover several different methods and disprove them. However, what methods DO actually work and why?
After decades of nutritional and exercise science research, the literature overwhelmingly points toward three primary factors for sustainable fat loss while preserving lean body mass: a moderate caloric deficit, adequate protein intake, and resistance training. Unlike fad diets or aggressive starvation protocols, these methods consistently demonstrate superior long-term body composition outcomes while minimizing muscle loss.
CALORIC DEFICIT + HIGH PROTEIN + RESISTANCE TRAINING
Caloric deficit:
The body loses fat when energy expenditure exceeds energy intake. Most evidence supports moderate deficits as significantly more sustainable and muscle-sparing than crash dieting or starvation-based methods. Instead of forcing the body into extreme deprivation, a moderate deficit allows fat stores to be utilized while reducing the amount of lean tissue lost during the process.
https://pmc.ncbi.nlm.nih.gov/articles/PMC8017325/
https://pubmed.ncbi.nlm.nih.gov/18025815/
https://www.mayoclinic.org/healthy-lifestyle/weight-loss/in-depth/calories/art-20048065
https://pmc.ncbi.nlm.nih.gov/articles/PMC9036397/
HIGH PROTEIN INTAKE:
High protein intake plays a major role in preserving lean body mass during weight loss. Protein intake is consistently shown throughout the literature to be one of the strongest predictors of muscle retention while dieting. Higher protein diets improve satiety, increase thermogenesis, support recovery from exercise, and reduce the amount of lean tissue lost during caloric restriction.
Research surrounding physique athletes and resistance-trained individuals frequently suggests protein intakes around 1.6–2.2 grams per kilogram of bodyweight per day during fat-loss phases. This becomes especially important during aggressive cuts, where the body is at a greater risk of breaking down muscle tissue for energy.
https://jissn.biomedcentral.com/articles/10.1186/1550-2783-11-20
https://pmc.ncbi.nlm.nih.gov/articles/PMC10974928/
https://nutritionsource.hsph.harvard.edu/what-should-you-eat/protein
RESISTANCE TRAINING:
Resistance training provides the primary anabolic signal that tells the body to preserve muscle tissue during a caloric deficit. Without resistance training, a much larger percentage of weight lost tends to come from lean mass rather than fat tissue. Studies consistently show that individuals who combine resistance training with adequate protein intake maintain significantly more muscle while dieting compared to dieting alone.
Resistance training also improves insulin sensitivity, metabolic health, physical performance, and long-term body composition outcomes. Rather than simply lowering body weight on a scale, resistance training shifts the focus toward improving body composition by maximizing fat loss while minimizing muscular atrophy.
https://pmc.ncbi.nlm.nih.gov/articles/PMC8365736/
https://pmc.ncbi.nlm.nih.gov/articles/PMC12851882/
https://blog.nasm.org/resistance-training-for-weight-loss
TAPERED WEIGHT-LOSS
My personal favorite and effective form of losing weight, ESPECIALLY in individuals with a larger Fat-mass percentage.
In the figures above, it is shown that the weight will end up hitting a wall due to BMR colliding with the deficit marker.
This method addresses and fixes that issue
While the body loses weight, it undergoes a few processes known as: Gluconeogenesis, Lipolysis, and Catabolism. To dumb it down, these processes help your body use untapped areas for Energy such as smooth muscle, Bones, and in most cases (especially in subjects with higher body fat concentrations), both Visceral and Subcutaneous fat.
Now, due to the body not really caring what it takes from during that catabolic state, Subjects with higher Fat Mass concentration Will experience significantly less bone wasting and muscular atrophy from this catabolic state.
Due to individuals with higher BFC experiencing less overall LBM reduction, it is commonly found that these individuals can afford a greater deficit and overall higher fat loss compared to LBM percentage reduction.
A Model following this structure would go as follows:
(for male subjects ONLY)
40% body fat could potentially lose 4-5lbs a week without significant atrophy
35% body fat could potentially lose 3-3.5lbs a week without significant atrophy
30% = 2.5-3lbs a week
25% = 2-2.5lbs
20=1.5lbs
15=0.5-1lbs
10%=0.5
Jordan=PSL
Chico=Appeal
Nobody is gonna read this shit, bro jfl
(For female subjects ONLY)
STRUCTURED IN PERCENTAGE OF TOTAL BW PER WEEK NOT LBS
(Individuals with severe obesity may sometimes tolerate higher rates temporarily under supervision)
45%+ = 1–1.5% PW
40% = 1–1.25% PW
35% = 0.8–1% PW
30% = 0.7–1% PW
25% = 0.5–0.8% PW
20% = 0.25–0.5% PW
https://www.nature.com/articles/0803483
https://pubmed.ncbi.nlm.nih.gov/22258266
https://link.springer.com/article/10.1186/1550-2783-11-20
https://pubmed.ncbi.nlm.nih.gov/21558571
https://pmc.ncbi.nlm.nih.gov/articles/PMC3673773
Section 6: Closing Statements
While I do think it is entirely possible to be able to preserve FFM and LBM with some of the other methods i think the two listed above are by far superior, safer, and easier to approach than the others I listed in the separate section. If you actually read this, holy shit Thank you. This took me like 3.5 hours, not accounting for the research.
This entire paper is, to the best of my knowledge, entirely accurate with clear sources and explanations. If there is anything that needs to be altered, PM me and I'd be happy to consider it.
The figure below shows the guy who followed my advice and read this
Last edited:
