Can you eliminate high blood sugar by changing your diet?

I usually get hungry after lunch but my doctor told me my health needs to improve so I avoided sugar and processed food for lunch today but my calorie intake was very low, much lower then normal. And now it's 4 and I have no hunger at all. It's possible my hunger was caused by blood sugar issues and not by low calorie meals.

Can you eliminate high blood sugar by changing your diet?
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