Why middle-age spread is a health threat
What's in a waistline?
Regardless of whether your weight has changed over the years, your height is likely to have decreased, the result of declining volume in the intervertebral discs of the spine. As your torso shortens, your abdominal organs have less vertical space to inhabit, so they move horizontally. If you haven't gained weight, an increase of an inch or two around the waist may simply reflect lost height.
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