I can attest to food combining problems. My life-long serious allergies all disappeared after I stopped eating carbs with anything else. The amount eaten is very important. Small ice cream is no problem. Big ice cream is bad. Meat with rice/potatoes/etc. causes very bad problems and acute allergic reactions (to histamine). And so on... these were just examples. My intestinal health and digestion is 100% better when separating carbs from fats/protein in higher (normal for most people) doses.