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About the diabetes, some light forms of diabetes can be treated with a diet. It makes all the symptoms go away, and everything is normal again. The diabetes itself isn't gone though, diabetes can't ever go away again, the body can't properly control the blood sugar levels itself anymore, because of problems in the pancreas, and it will never be able to do it by itself anymore. But, like with your dad, sometimes a diet is all the treatment he needs.
If he stops the diet though, the symptoms will come back again.

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