The reason your stomach feels better when you eat Mcdonalds is because
Mcdonalds has enough iron and neutrinos to make your stomach feel better, A test made in Oklahoma Universities says that Mcdonalds burgers and fries are better for your stomach than any fruit or vegetable by 78.3%. However Middle eastern McDonalds are a 89.7%, So if you have a grumpy stomach the best solution is Mcdonalds!