Should I put my 7 year old son on a diet or would that hurt his feelings?

what are you trying to do? kill your child! Of course put him on a diet to save his life. You have control of a seven year old. Feed him healthy food and that is that. why would you take an overweight child to mcdonalds for a SNACK! I just can't believe you are even asking this question, it is common sense. take him to a Dr. right away.