Girls, three weeks now, I'm honest, I know what I can eat while breast…

Girls, three weeks now, I'm honest, I know what I can eat while breastfeeding, like fruits and maybe something sweet, I really love sweets but I'm not eating anything right now, afraid of it, the pediatrician came, says my daughter is a little red, eat something sweet, I say no, someone says eat everything you ate, just less, someone says there's no allergy, the stomach will be upset, I know that all red stuff is bad, then what to enjoy myself in food?