A double chin is the accumulation of adipose tissue, sagging skin or water retention under the chin, forming a characteristic fold between the face and the neck. This phenomenon is extremely common; it can affect anyone, regardless of weight or age, and has absolutely no impact on health.
A matter of genetics and body type
Genetic predisposition plays a role that is often underestimated. Some people naturally inherit a jawbone structure or a slightly receding chin, which contributes to the appearance of a double chin. Skin quality and fat distribution are also partly determined by genes.
The accumulation of subcutaneous fat
The area under the chin is one of the places where the body stores fat as a priority, especially when gaining weight overall. This fat is often difficult to eliminate, even with dietary changes, because the body cannot target a specific area during weight loss.
Age-related skin sagging
Over time, the production of collagen andelastin in the dermis naturally decreases. These two structural proteins are responsible for the firmness and elasticity of the skin. When they become deficient, the skin loses its tone and begins to "sag," particularly around the neck and chin. This process accelerates after age 40 and can cause or accentuate a double chin.
Posture and lifestyle
An often-overlooked factor: posture. Spending many hours with your head tilted forward—whether in front of a screen, a phone, or a desk—creates chronic tension in the neck and gradually weakens the muscles of the jawline and chin. This poor posture, sometimes called "tech neck" or "phone neck", contributes to sagging and the formation of a double chin over time.











