Loss of the Fat Mass in Space – Weightlessness/Microgravit

In weightlessness (microgravity), the human body is affected with involuntary loss of the muscle, bone and fat mass.


  1. Body has weight because of the pull of gravity.
  2. In weightlessness, the body doesn’t have weight.
  3. No one can lose weight in weightlessness. (You can’t lose something that you don’t have.)
  4. In weightlessness, the human body, like any physical object, has mass. In an environment of 1G and in weightlessness, the body has mass.

For the time being in weightlessness/microgravity, increased food intakes will not even slow the loss of the muscles, bones and fat mass.

There is no supplement, drugs or any kind of food that will even slow in weightlessness the atrophy of the muscles bones and fat mass.

It is obvious that even a Bear will not gain body mass in weightlessness, despite excessive feeding, nor it will be saved from atrophy of the existing body mass.

The involuntary loss of the muscles, bones and fat mass is one major obstacle for any possible prolonged space travel.

The only way to slow the ATROPHY of the muscles, bones and FAT MASS is to do exercises on a specially designed exercises device for weightlessness.

The example of how the weightlessness affect the body mass regulation, shows us that without the pull of gravity it will be not only impossible to gain body mass whether it is muscles mass, bones mass or FAT MASS, it would also be impossible to maintain the existing body weight whether you are human or a bear.

The biological basis of fat mass formation and the mechanisms of body fat distribution can be understood by almost everyone, but it takes time to explain.

The article on my website: Food, Water, Air, Physical Activity, Gravity and Weight Gain/Weight Loss explain a little bit more about regulating the mechanism of weight gain and weight loss.

That article doesn’t explain everything, but it is the first step to understand the biological basis of fat mass formation. (Actually it should be the talk of fat cells formation and fat mass formation but for the sake of simplicity, I  mentioned only fat mass formation because formation of the fat cells causes an increase of the fat mass and an increase of the size of single cell increases body fat mass.

Please note:

There is only one biological basis of fat mass formation.

There are many mechanisms underlining body fat mass distributions.

You may like to read more about weightlessness and about the real science of weight gain and weight loss.


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