The Science Behind Why You Shouldn’t Worry About Weight Gain
This can lead many to think; “I’m going to regain all the weight I’ve lost”.
The prospect of this might be quite anxiety-inducing and even cause some people to lose the confidence to be sociable, put a strain on relationships, and potentially miss out on enjoying new food experiences.
Understanding how weight change works and how rapidly you can regain weight can help to put your mind at ease and free you from these worries.
How weight change works
Outside of changing body composition at a steady weight, almost all contributions to body fat gain can be explained by changes in body weight.
However, short term changes in weight can actually be down to a whole host of other reasons, including:
Changes in levels of sex hormones1 Increased fibre and food volume intake2 Needing to go to the bathroom Changes in body water3 - Inflammation
That's why a more gradual change in body weight is a greater indicator of weight gain, i.e. increases in lean muscle mass, fat mass, bone density etc.
This is because it relates to lean muscle mass and fat mass changes, which involve a very basic principle of energy in vs. energy out. Or, calories in vs calories out.
Quite simply, if your goal is to lose weight, then you need to consume fewer calories than the number required to maintain your weight — a bit like when you're trying to save money you spend less than what comes in on your paycheck.
If your goal is to gain weight then you need to consume more calories than required to maintain — this is not like saving money, and if you take the same approach you will be in debt very quickly!
If you aim to maintain your weight and focus more on body re-composition, then you need to eat at a calorie intake around your maintenance, and focus more on macro splits and nutrient timing.
That’s how weight change works in a nutshell. It’s relatively straightforward and not as scary as you’ve been made to believe. However, sometimes weight isn't the issue — it's your body fat.
How quickly can you regain lost body fat ?
How fast you regain any body fat depends on whether you consumed more energy than you spent over that day.
If the body doesn’t burn it off through increased exercise it may also use it for muscle building or some other beneficial function.
To get to grips with how much body fat you could gain in a day you must understand some of the following factors that are at play:
Here's how to calculate your TDEE.
Glycogen stores are the body’s internal stores of carbohydrate found in muscle tissue and the liver. The more glycogen we deplete, the more food that we eat will be taken in and stored as glycogen as opposed to fat
Studies have shown that protein overfeeding, or the consumption of a high protein diet,
When investigating differences in fat storage following overeating between carbohydrates and fats with a 50% calorie surplus, it was shown that after one day of overfeeding, those who overfed on carbohydrates stored only 10% of that as fat. Those who overfed on fat, however, stored 60% of that as fat.
This is important as NEAT varies greatly between person to person and increases in response to overfeeding.
Those with greater levels of body fat have more fat cells to store fat. Those who are leaner are likelier to have less. So, leaner individuals may have a reduced capacity to store fat.
Don't stress about the slip-ups
This number decreases even further when the groups are informed about, and taught the skills to adequately track calorie intake.
- Doing exercise
- Eating a higher protein diet
- Having a diet of greater nutritional density, quality and consistency
So it's more than likely that you're already doing the right things to combat regaining any significant amount of body weight.
Take-Home Message
Stick to what you’ve been practising — exercise, a high-protein diet, more fruits and vegetables, and being kind to yourself. The odd chocolate bar here and there won’t kill you or ruin your diet.
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