They eat less because their brain receives stronger satiety signals, and food moves through their digestive system more slowly, extending the feeling of fullness after meals
Retrieved September 4, 2014
This is one rabbit study, not human evidence
Vegetarians and vegans are found to be most common to suffer from B12 deficiency due to a lack of animal products in their diets
(2) Vitamin B12 is found naturally in a wide variety of animal proteins, so the body can obtain the recommended amounts of vitamin B12 by eating a variety of foods including: Organ meats (beef liver) Shellfish (clams) Meat, poultry, eggs, milk and other dairy foods Fortified cereals and nutritional yeasts A lack of vitamin B12 (B12 deficiency) occurs when the body does not get or is unable to absorb the amount of vitamin that the body needs
The absorption rate is typically higher than that of oral supplements, resulting in faster and more efficient management of deficiency symptoms