That has got to be an old wives tale cause with my 1st, 2nd & 3rd pregnancies I ate sugar everyday. I ate icecream,fruit rollups,candybars. I ate those every single day of my pregnancy my babies were just fine. Not one had colic at all. Now I did gain way too much weight though with those pregnancies. Now I am on pregnancy #4 & I m eating so much better with this one. I have gained what is recommended instead of over eating.