People with less fat under the skin but more fat around organs have more metabolic problems than those with more subcutaneous fat but less visceral fat, even if they weigh less and have smaller waists.

Almost 3 out of 10 middle-aged people have mismatched fat distribution: some have more internal fat but less under the skin, while others have the opposite, showing fat isn't always stored the same way.

In women with belly fat, waist size and total body fat are linked to both deep belly fat and under-skin fat.

As people get older, they tend to have more fat around their organs and less under the skin, making weight and waist measurements less reliable for detecting health risks in seniors.

Even among people classified as obese by BMI, about 1 in 4 men and 1 in 10 women don't have excess fat around their organs, showing BMI doesn't always reflect internal fat levels.

Among people with a normal weight (BMI under 30), about 1 in 10 men and 1 in 9 women have too much fat around their internal organs, showing that weight alone doesn't always reveal hidden health risks.