/ck/ - Food & Cooking

Legit question for militant vegetarians/vegans. I feel that some vegetarians and vegans hold disdain for people that eat meat, and in their 'perfect world order', everyone would follow a strictly vegetarian/vegan diet. I tried to follow such a diet for a period of 4 months, during which i was diagnosed with ulcerative colitis. My doctor stated that my body couldn't functionally process the fibre provided by an all vegetable diet and that I would face significant digestive issues unless i switched to a meat protein heavy diet. I disregarded their advice and my health continued to decline until i reached a point that i felt i could no longer ignore their advice. I now follow a dietary regime which is low-carb, high protein, medium fat with an 80/20 meat to vegetable routine, and my body is responding incredibly well.
If we lived in a world where everyone was vegetarian/vegan, how would you propose to deal with people whose diet, due to allergies etc, required them to eat meat to survive? How do you feel about the fact that there are actually people out their that NEED meat to maintain a healthy diet?

Not trolling - genuinely interested in feedback, especially if it's not of the 'omg your wrong veg is all you need, your doctor is an idiot' variety.