The 10 Worst Health Risks of a Vegetarian Diet.

6. Protein Deficiency

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When Henry David Thoreau’s omnivorous neighbors warned him that his vegetarian diet would make him weak, he pointed out the irony that the cows they were killing and eating were entirely grass-fed. Yet protein deficiency is a real danger for humans who become vegetarians. Foods like eggs, nuts, and legumes can provide vital proteins missing from a meatless diet. Without them, one runs the risk of losing hair and muscle mass.

5. Autoimmune Disorders
Several prominent doctors, including Dr. Ashton Embry and Dr. Terry Wahls, maintain that there is a link between vegetarianism and autoimmune disorders like multiple sclerosis. In his book The Wahls Protocol, Dr. Wahls relates how he began developing multiple sclerosis symptoms after 15 years without meat. After being confined to a wheelchair, he reluctantly agreed to introduce poultry, fish, and other meats back into his diet. He attributes his renewed health to this dieting choice.