Every time I drink milk, I fart too much and get diahrea at the end. Is this diabetes?

there's your problem

dubbies speaketh the truth

Oh I'm not the one with the problem; I don't eat cereal, but a lot of people do and it is a popular breakfast option, unfortunately, in a lot of the developed world. Also water isn't fortified with B12, zinc and D, while most nondairy milk beverages are, so instead of using water to cook your oats you can use fortified nondairy milks instead and make it more nutritious.

or you could get enough B12, zinc and D by eating a non-retarded diet

B12 deficiency is pretty common among people following all sorts of diets… And pretty much every modern human in the developed world is vitamin D deficient. Zinc deficiency is less common, but insecure men are always worried about getting enough zinc so I decided to throw that one in there as well.

Sorry to tell you this user, but you have aids.