Will eating one meal from McDonald's make me gain weight?

cocolicious

New member
So I usually don't eat fast food that often, but today I thought one meal wouldn't hurt. Was I wrong? I had a fish sandwich and a medium fry. Everything thing else that I had yesterday was healthy though. For breakfast, I just had a salad and a banana and five oatmeal cookies (not big) with milk; for lunch, I had oatmeal and some grapes. Then I had McDonald's and a few hours later, baked tilapia over brown rice with a salad. Also, all I drink is water and I do work out.
 
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