Fasting can certainly raise uric acid.
But exercise raises uric acid more than fasting, yet exercise is still recommended. It looks like regular exercise can lower one’s average uric acid as one’s metabolism adjusts even though it causes an immediate increase in uric acid. Weight loss also raises uric acid while you’re losing weight but lowers uric acid afterwards. Maybe something similar happens with mild fasting. Bottom line: your uric acid tests will tell.
In any case moderation is recommended. Whether it be exercise, weight loss or fasting, I would take the way you feel as a guide: if you’re feeling fine, you’re probably not overdoing it. Some of us can fast longer than others.
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