In several recent studies, different groups ate the same foods except for the amounts of meat. Even controlling for equal calories, the more meat a person ate, the more weight they gained. Those who ate 1.5 servings or more of meat a day crossed the threshold of a BMI of 25 to become officially classified as overweight.
A new study found that chicken consumption in particular was most associated with weight gain in both men and women. Even those who ate the equivalent of a single chicken breast once every two weeks (compared to those who didn’t eat any chicken at all), had a significantly greater increase in their body mass index. That’s around one chicken nugget per day. See more on Poultry and Weight Gain here.