I'm a mid-career physician and you are exaggerating like a medical student. It's not impressive.

Yes, this isn't the healthiest food. Will it kill you? Too much of nearly anything will kill you. Nothing wrong with fast food once in a while. It still has protein, carbs, fats, vitamins, and minerals. The biggest issue with too much fast food is fatty and calorie dense foods that increase risk of obesity and, arterial plaques, and heart disease. Obesity increases risk of cancer. But hey, if you want to wax eloquently about hepatic phosphate sequestration from HFCS, go right ahead. It won't help your patients as much as recommending healthy moderation and exercise.