Someone (bodybuilder) made the comment today.
"I don't eat fat. Fats will make you gain weight not just sugar. It breaks down in the body and fats turn into sugars after. Not just sugar spikes your blood sugar."
Fat does not get turned into sugar! Only if insulin is present because you had a high carb meal, does the excess fat get stored, but it doesn't convert into sugar. Am I wrong here?
Fat does not break down into sugar. It is either stored (in fat as fat) or it is oxidized (burned).
Many people do not realize that fat does get stored even if your in fat burning mode and even when your not eating carbs. If someone in ketosis sat down and ate or drank 200 grams of fat in one meal, (1800 cals) that fat will go into storage, but it will come out as needed for fuel.
You are also right, that in a mixed meal of course, fat gets stored then too. The difference is in a mixed meal with carbs, fat burning is turned down low in the presence of insulin. This allows the glucose to be burned off for a time period directly related to how much glucose is present.
The human body is pretty amazing, it can basically convert any form of food into any other. According to Chris Masterjohn, it is possible to convert fat to glucose.
At a high level, in terms of the bodybuilding diet with high carb+protein, he's correct. You eat that high carb/protein + high fat and the fat gets stored.
In detail however, he's not correct. Yeah, fat can get converted to some glucose, but it's a fairly negligible level and as needed, not all the time. It's not a major threat. You eat low carb/high fat and the majority doesn't get stored, it gets used, etc.
The Tenacious Insulin Bump 5 Answers