What is the cause of exclusively central obesity?

Genetics: How and where a person stores excess fat is genetics. But lifestyle can overcome it - eat healthier.

Hormone dysfunction: Often central obesity is a function of hormone dysfunction. In women, estrogen receptors are found in your belly. Estrogen dysfunction/dominance leads to central weight gain; additionally dysfunctional bleeding, heavy cycles, migraines, fatigue, etc. It also may be a sign of thyroid dysfunction and leptin resistance. Seek the advice of a bariatrician who also is skilled with hormone therapy.