Skip meals and avoid all carbohydrates, that can do some damage to your body.
Answer:
He probably suffers from lactose intolerance.
Explanation:
Suffering from lactose intolerance doesn't mean you have to eliminate all kind of lactose from your diet, will depend on the degree of intolerance of the person and the food, since not all lactose have the same concentration
. For example yogurts go through a fermentation process, and have a low lactose concentration, with cheeses, it is recommended to consume those with a greater degree of maturity, since the greater the maturity the less amount of lactose they will contain.
I agree with the answer above and would like to add on to it. When looking at nutrition labels you should be looking at what ingredients was used to make the food, including the chemical compositions. For an example, some people are allergic to peanut butter, therefore it is their responsibility to check the label so that they know what company made it and the ingredients. Also remember to check the expiring date :D