A recent study of 100,000 men and 270,000 women from 10 European countries commissioned by Imperial College London found that people who avoid meat are slimmer. The results, recently published in the American Journal of Nutrition, show that avid meat eaters gained more weight over five years than those who ate less meat but ingested the same general number of calories.
The research uncovered the strongest association for weight gain was poultry, followed by processed meats and red meat. Over a five-year period, the average person in the study gained about a pound a year, with the women in the study showing a slightly smaller gain. However, those participants who ate more meat showed a higher weight gain. For every additional 250 grams of meat eaten, the five-year weight gain was a bit over four pounds higher.