Styrene
No one has the same definition of healthy.
As well,
In order for fat people to be fat they have to intake enough calories to maintain that weight. 170lb person needs more calories to maintain that weight than a 100lb person. This is common knowledge.
It's not true in every case. Metabolism is blamed for many things, and so is calorie intake and conscious activity, but in laboratory conditions, many of the theories just didn't pan out.
For one, people's metabolism doesn't actually vary that much as far as fuel (fat/carb) burning. The difference between a "naturally thin" person's "fast" metabolism, and let's say, a hypothyroid person's "slow" metabolism might be something like 50kcal if they are the same weight. Larger people often have even faster metabolisms than the "naturally thin".
What "naturally thin" actually means is prone to thinness. A combination of factors aside of metabolism go into that, and one of the big ones is a low appetite and higher unconscious activity levels. Some people move more when they sleep or while they are sitting. Also people who spasm or "stim" are constantly burning, even if they're not aware of it.
A "naturally fat" person, or someone prone to fatness may work out just as much as a naturally thin person, and eat the exact same thing, but they aren't moving as much when they sleep or when they're being still. I figured that out that was true in real life outside a lab when I became hypothyroid. My daily activity was making me much more tired than it used to, and my limberness reduced, so I was moving less in normal life.
Another thing that affects weight and appetite and food intake is digestive efficiency. Some people have problems that for some reason prevent their optimal absorption of certain nutrients. They have to eat more to get in enough iron or calcium than the average person, for instance.
One thing many of the weight loss experts don't like to talk about, but does factor in in this and hormonal issues, is pollution. There are so many more estrogenic and damaging compounds in our environment that it's not even funny. I stopped drinking from plastic cups, especially hot liquids from them, when a study came out that revealed that they're almost universally washed or processed or cured in chemicals that screw up your chromosomes and overload the body with estrogenic chemicals. The same reason guys are less fertile nowadays is the same reason the population of alligators and certain species of frogs are dying out even though they're protected...except humans get a little exposure compared to animals who get the stuff dumped into their water supply directly.
Male alligators in increasing numbers' weewees are too small to even copulate, much less breed.
So anyway, humans especially near industrial areas, are exposed to all kinds of mess that screws them up, and fatness is sometimes one of the results of it, and sometimes a protective factor. If women's bodies are in a crisis, they actually fight against factors that would reduce their fertility. Exposure to toxic chemicals puts the body in this mode, and they will attempt to swing the balance. The males have a lower sperm count (like 80% less than there used to be when they first discovered how to do that), so the females have to be at maximum physical conditions for carrying babies. So some fatness may actually be an instinctive, unconscious reaction to the state of the world economically and environmentally. It seems in the places where people can afford to be fat, they are fat despite the untrendiness of it.
Whether it is healthier or unhealthier to be fat, folks need to stop assigning a moral value to it. It comes from Christian beliefs that gluttony is a sin. Well sex except for purposes of reproduction is also a sin under that moral system...so is "witchcraft" as in anybody's religion except theirs, and atheism, and *thinking* about doing something wrong.
Fatphobia is part of that backwards mentality, and aside of that, it's psychologically unhealthy. If you want to lose weight, or like being thin, or have a preference for thinness, cool...but there's no reason to think that you are better or more moral or above someone else who weighs more.
You may just be able to operate on less calcium, iron, or B vitamins than someone else. Not all bodies are the same.
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