re: Why are people so fat now compared to just 30 years ago?

People overeat everything they eat.

People don’t fast long enough to process the insulin in their system…insulin stores fat…even the healthiest of foods produce insulin, if you eat in too short a time period you never process the insulin and so you never burn your fat reserves.
Back in the day, people ate dinner at 530pm and then didn’t eat breakfast until 7 or 8 the next morning. Now people snack all the time, eat too much processed food, artificial sweeteners produce insulin at a higher rate than other foods so people think they are being healthy but they are not…
Intermittent fasting is key to maintaining a healthy weight or losing weight.

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Ok, so it’s the food? Food is an inanimate object that we are blaming

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Again, the biochemical processing of 'food' is not simply thermodynamic. It involves hormonal control as well, with exceedingly complex interactions that I could go over. The nutritional profile of food matters, regardless of whether you want to blame an 'inanimate' object.

If there was any other disease with the same demographic profile illustrated as in the OP, we absolutely would not resort to frankly idiotic defenses of 'individualism' that we do in regards to food. Nearly 70% of Americans are overweight, and 33% are obese, which seems to suggest questions of individual choice are much less important than the nutritional content of the food itself. At those population levels, suggesting people are continually making poor decisions without a distinct physiological cause that is directly modulated by exogenous metabolites would be insane for literally any other disease category. The sheer hesitancy of actually treating obesity as a pathology is why we are in this position.

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Why are people eating these foods?

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Because these foods can modulate physiologic elements so that there is limited satiation, absent effects of leptin, no insulin response in terms of fructose, and no rate-limiting step of fructose metabolism until it either enters glycolysis or becomes pyruvate, at which point it can enter several possible metabolic pathways, depending on macromolecular and micromolecular needs.

Although diet and exercise are huge factors and play into this, it’s also public perception of what is fat is changing by the decade. So many people don’t realize just how fat they are. They keep gaining more and more but they think “I just to lose like 10-15 pounds and I’ll be good”. Obviously this doesn’t apply to the people who are very obese

At one point x pounds over normal weight is seen as fat by the majority of people. But as people becoming fatter, that number seems normal now since it applies to so many people. A decade later 10 more pounds of whatever number that x was, is now considered fat. Until more people ballon up to that. And so on...

Extreme decline in the quality of healthy food plays a part.

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At one point x pounds over normal weight is seen as fat by the majority of people. But as people becoming fatter, that number seems normal now since it applies to so many people. A decade later 10 more pounds of whatever number that x was, is now considered fat. Until more people ballon up to that. And so on...

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The morbidly obese were literally considered circus sideshow acts 60 years ago.

People have zero concept of a healthy weight.

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Good pyramid and less red meat

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The govt said red meat was bad , butter bad, eat more carbs, less fat, etc.

The food pyramid is upside down. Eat more fat, more meat and your sugar levels don’t spike and then crash and then you want to eat again. Fat satiates you.

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Seed oils are a huge factor. They're in everything now.

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Yep and "food" companies engineer addictive sugar and shitty-fat (oil) bombs. Throw in some salt (in and of itself sodium isn't usually an issue, ftr) and flavor enhancers and you have people gorging on unsatisfying nutrient deficient calories that are also terrible for your metabolic health and well no shite.

Oopswrongthread

Im 6’2” and 185 lbs - everyone likes to tell me I’m too skinny. Maybe that’s why - I think it’s ridiculous