High amniotic fluid

My amniotic fluid levels have come out border line high again. The baby is measuring okay and his kidneys are working fine as per the ultrasound. The doctor and sonoligist both keep asking about my sugar intake and think I am lying about not taking any sugar. The only sweet thing I eat is water melon and that too in moderation. Stressing out. Anyone else had borderline high fluid and could control it with diet management? What did you eat / stop eating?