How does fat in bloodstream know to deposit itself into fat cells and stay there? Does it go everywhere but get rejected by all other kinds of cells?
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Basically yes, this is how all molecules in the bloodstream work. It’s the same with medicines like antibiotics, as well as hormones like insulin and adrenaline.
However, with fat cells it’s a little different because the fats aren’t in the bloodstream trying to find the fat cells. Rather, your fat cells use the excess energy in your bloodstream to create the fat stores within them (this is why you can get fat eating excess sugar or protein). This is part of why refined sugars which are rapidly absorbed into the bloodstream have been shown to play such a significant role in weight gain, because they cause your blood sugar to spike and stimulate the production of fat reserves for fat cells.
It’s also worth noting that fats are an essential part of a balenced diet. Fats were demonized for a very long time, and this has been shown to have been untrue. Consumption of the right kinds of fats, in the right amounts, is beneficial, not detrimental, to your health.
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