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The Science Behind Weight Loss and What Works
The Fundamentals:
So essentially, losing weight or gaining weight comes down to calories in vs. calories out, everyone knows that.
What Is A Calorie?
A calorie is just a measurement of energy. Your body needs energy to do everything, including breathing, thinking, moving, digesting food, exercising, and staying alive.
Explaining Metabolism
The amount of calories your body needs at complete rest is called your BMR (Basal Metabolic Rate). This is the amount of energy your body would burn if you stayed in bed all day and did absolutely nothing. Your body still uses calories because your heart beats, your lungs work, your brain functions, and your organs stay active.
What BMR Isn’t:
A common misunderstanding is thinking BMR is the amount of calories where you won’t gain or lose weight, but that is not correct.
TDEE What It Is And How To Use It
The amount of calories where your weight stays about the same is called your TDEE (Total Daily Energy Expenditure), also known as your maintenance calories.
Your TDEE is: BMR + all the calories you burn during the day
This includes:
The Fundamentals:
So essentially, losing weight or gaining weight comes down to calories in vs. calories out, everyone knows that.
What Is A Calorie?
A calorie is just a measurement of energy. Your body needs energy to do everything, including breathing, thinking, moving, digesting food, exercising, and staying alive.
Explaining Metabolism
The amount of calories your body needs at complete rest is called your BMR (Basal Metabolic Rate). This is the amount of energy your body would burn if you stayed in bed all day and did absolutely nothing. Your body still uses calories because your heart beats, your lungs work, your brain functions, and your organs stay active.
What BMR Isn’t:
A common misunderstanding is thinking BMR is the amount of calories where you won’t gain or lose weight, but that is not correct.
TDEE What It Is And How To Use It
The amount of calories where your weight stays about the same is called your TDEE (Total Daily Energy Expenditure), also known as your maintenance calories.
Your TDEE is: BMR + all the calories you burn during the day
This includes:
- Walking
- Working out
- Standing
- Moving around
- Digestion
- Sports
- Everyday activities
- Basically all movement and energy use throughout the day
For example:
- If your BMR is 2,300 calories
- And your body burns 700 calories through activity during the day
Your TDEE (maintenance calories) would be about 3,000 calories.
That means:
That means:
- If you eat around 3,000 calories, your weight would generally stay similar over time.
- If you eat more than 3,000 calories such as 3,300 calories (a ~300 calorie surplus), you’ll generally gain weight.
- If you eat less than 3,000 calories such as 2,700 calories (a ~300 calorie deficit), you’ll generally lose weight.
The Science Behind TDEE
This works because when your body gets more energy than it currently needs, it stores much of that extra energy, mostly as body fat, so it can be used later.
TDEE And Weight-loss Over Time
When you eat below your TDEE, your body still needs energy to function, so it starts using stored energy. Most of that comes from body fat, and some can come from muscle if the deficit is too aggressive or protein and resistance training are too low.
Over time:
This works because when your body gets more energy than it currently needs, it stores much of that extra energy, mostly as body fat, so it can be used later.
TDEE And Weight-loss Over Time
When you eat below your TDEE, your body still needs energy to function, so it starts using stored energy. Most of that comes from body fat, and some can come from muscle if the deficit is too aggressive or protein and resistance training are too low.
Over time:
- Calories in > calories out = weight gain
- Calories in < calories out = weight loss
- Calories in = calories out = weight maintenance
How To Find YOUR TDEE And BMR
To estimate your maintenance calories:
To estimate your maintenance calories:
- Use an online BMR calculator and enter your information.
- Estimate your average activity level.
- The calculator combines those to estimate your TDEE (maintenance calories).
That number is your starting point for deciding whether you want to lose weight, maintain weight, or gain weight.
Sources:
Sources:
Source for calorie information
source for TDEE and expenditure information
Another study on the effects of calorie modulation in weight changes
guess what ANOTHER SOURCE WOWWWW
i’m sucha good grey n~ngh…
@TonyDr edited even changed the title so it can be more accessible for people that aren’t retardmaxxers
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