@raytreats
I believe Ray has said that once we stop growing, our metabolism starts to decline. The growth process uses a lot of energy in building structure.
This internal metabolism declines and if we continue the same lifestyle as we had as growing kids/adults, we won't be burning as much energy internally and we would have to start exercising more to burn that energy, or else it turns into potential energy in the form of fats.
But not everyone becomes fat. Those who don't already live a lifestyle where they have optimal mitochondrial oxidation. Their internal machinery continues to burn sugar well and the sugar does not accumulate and turn into fats by the liver. Their blood sugar is normal and stable between meals. Because they produce a lot of CO2 as well, they tend to metabolize sugar efficiently because their tissues are well oxygenated because of the Bohr effect of CO2 in blood, which allows oxygen to be released generously by blood to tissues.
A lot of this getting fat while getting older has to do with PUFAs displacing sugar as an energy source. Due to the predominant presence of PUFAs in the diet since childhood and accumulated in the fat issues.
Poorer health will result and a long term fix is to allow the body to reset by stopping the intake of PUFAs and to allow the body to use up its PUFA stores over a natural process of releasing fats from fat cells and using it up over about 4 years. During this transition, it is unavoidable that the PUFAs will cause lipid peroxidation and the best thing we can do is to supplement with vitamin E to mitigate the effects of peroxidation. It will also help to supplement with VCO or other saturated fats so we.can increase the ratio of sat fats over PUFAs being metabolized.