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Trying to understand how this would occur - why would someone's face be fat (either in general or compared to body) when the rest of their body is toned/lean/skinny. Ive observed this personally for years and in others -

I read that excess sugar can cause excess collagen in face, thus causing the "bloating" look. What else might be the cause of a disproportionately fat face/neck when the person appears skinny everywhere else?

If they consume a high amount of one food (for example nuts)- could this be a permanent state of allergic reaction?

How would one narrow the factors to determine what is causing the "face fat"?

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    If it's constant and stable from birth, it's probably genetic. Enlarged facial bones in acromegaly can result in big head appearance - this happens in adults. Fat deposits in Cushing's disease give an appearance of "moon face." – Jan Jul 28 '18 at 9:32
  • if it only started during adolescence, is there any way to fix it? – skyguy Jul 30 '18 at 1:04
  • It depends what it is. I mentioned only 2 of many possible causes in my above comment. It's unlikely someone her will guess what it is just from a simple description. If you are concerned, visit a doctor who can give you an exact diagnosis and tell you what can be done. – Jan Jul 30 '18 at 7:23