The fast food service Mcdonalds has many calories because all they sell there is just burgers, fries, sodas, and pies. Those foods are unhealthy and considered to be junk food with all that grease people like, the grease and fried food is what makes people fat since it got so many unhealthy calories. Some meals on their like the oatmeal and lettuce Mcwrap may be healthy but most of their food is unhealthy because the more calories it has, the more good it tastes so it brings in customers like a fisherman brings fish but instead of a scam, its just not giving your body what it really needs.