It’s about Leptin Resistance. Some genetic lines do not develop it as rapidly when following the NAD. The men on my mother’s side do have this trait. Those on my Father’s side, like me, do.not.What happens is their resistance levels do not get high enough for excess fat gain until older, even Middle Age. They also are the type who develop Type II Diabetes while still fairly lean.
What has happened with our younger generations is that the whole low fat conceit has overridden this trait, causing them to develop leptin resistance at younger ages.
These are also the folks that have the easiest time losing fat once their resistance levels drop.
That is a rabbit hole I don’t want to go down any further for the time being, but my wade around found this interesting tidbit which would explain why some people need strict no fructose eating to lose the weight, their genes don’t know how to break up fructose, mine is the normal one which would explain why I can have all the berries, a bit of apple/pear/figs without adverse effect: https://www.snpedia.com/index.php/rs1800546
Funny how there’s likely no feathers ruffled if you mentioned you have Hereditary Fructose Intolerance and therefore must abstain from fruit and sugar and sweets. But if you say the same thing when you just have standard T2DM, everyone just loses their minds.
Also, did we just discover the cause of spontaneous human combustion? Hydrogen is pretty flammable…
The current gold standard for testing of fructose intolerance is the hydrogen breath test, in which the patient is administered fructose in the clinical setting, and hydrogen levels are measured before and at intervals after administration of the bolus of fructose. An increase in hydrogen produced reflects the failure of the patient to absorb fructose, which is then metabolized by bacteria in the gastrointestinal system to give off hydrogen. The disadvantage of this test is that many patients respond to the fructose administration with signs of severe hypoglycemia including altered consciousness, diaphoresis, and seizures, sometimes resulting in death.
Kind of mean that the gold standard of testing HFI is deadly. You’d think that genetic testing would be considered more positive.
Boy, different world now… 
