Comment by CyberDildonics
1 year ago
Calories absorbed vs calories expended is physics, but it doesn't explain why people are storing more calories over time.
The idea that all calories are the same is not even held by people who say "everything is just about calories". Ask them what you need to build muscle and they will say protein. Suddenly not all calories are the same.
Fructose is does not stop hunger as much and is more easily stored as fat.
> and is more easily stored as fat
Dietary fat is even more easily stored as fat, since it doesn't require the added step of de novo lipogenesis (DNL) like carbohydrate does, or the added steps of gluconeogenesis + DNL as protein does. And go look up recent photos of Lustig: he's fat (bordering on obese) himself.
Lustig: he's fat (bordering on obese) himself.
This is not relevant to arguments (with sources and statistics) about systemic obesity he presents.
If dietary fat is more easily stored as fat, why do keto diets work?
Also do you have sources or data that says what you are saying here?
> This is not relevant to arguments (with sources and statistics) about systemic obesity he presents.
Yes it absolutely is, since he claims he doesn't eat sugar for all the reasons he cites, yet he's fat and looks metabolically unhealthy:
https://www.wnycstudios.org/podcasts/heresthething/episodes/...
>Robert Lustig: I carry a few extra pounds and I’m not happy about it. I don’t eat sugar.
>Alec Baldwin: You don’t.
>Robert Lustig: No. I have dessert twice a year. When I’m in New York I have a piece of Junior’s cheesecake and when I’m in New Orleans I have bread pudding -
Notice his twice yearly dessert sugar indulgences are high in fat.
> If dietary fat is more easily stored as fat,
You seriously believe your body preferentially uses de novo lipogenesis to convert carbohydrate to fat (which entails some energy loss) rather than just storing fat as fat? DNL on a typical mixed macro diet is rare, to the point that something like 90% of your bodyfat came from fat you ate, and the fatty acid profile of your body mirrors that of your diet: https://pubmed.ncbi.nlm.nih.gov/12324287/
Even in low-carb circles, this is tacitly acknowledged now by warning against eating meat from animals fed a high-PUFA diet, like poultry.
I'm not saying overeating carbs won't make you fat, but arguing that it somehow makes you fatter, calorie-for-calorie, than fat is ridiculous considering that eventually your body runs out of fat and has to use DNL (which is inefficient), and that fats require the least energy for your body to digest of any macro.
> why do keto diets work?
They don't, at least not any better than low-fat diets. They seem to work better initially because keto dieters lose a lot more weight early, but that weight is disproportionately fat-free mass, i.e., water, glycogen, and probably at least some lean body mass (muscle and bone density). See the graph on p. 4 of Kevin Hall's NIH study comparing the diets:
https://sci-hub.se/10.1038/s41591-020-01209-1
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