In men with belly fat, deep abdominal fat is linked to certain blood chemicals like PC 32:0, but under-skin fat isn't.

For men with belly fat, certain fats and a specific phospholipid are linked to deep abdominal fat.

In people with extra belly fat, certain blood chemicals are linked to how fat is stored around the waist versus hips, in the belly, and under the skin.

For women with belly fat, certain blood chemicals like insulin and specific fats are linked to the amount of fat stored deep in the abdomen.

Fat around the belly (visceral fat) is worse for your liver and metabolism than just being overweight overall—because it dumps harmful fats and chemicals straight into your liver.

Some scientists thought that fat around the organs might make too much of the stress hormone cortisol locally, which could make people gain weight—but after looking at many studies, it seems this probably isn’t a big reason for obesity.