The surveyors asked people in 17 places around the world, “Why do you think you’re gaining weight?” Their sample sizes varied between 505 and 2,251 in each market. Read on to discover if you align with the majority of people about the most common cause of weight gain right now. Cited as main reason for weight gain: 7 percent Cited as main reason for weight gain: 9 percent Cited as main reason for weight gain: 11 percentae0fcc31ae342fd3a1346ebb1f342fcb Cited as main reason for weight gain: 35 percent RELATED: 13 Surprising Things That May Be Causing You to Gain Weight, Doctors Say. Cited as main reason for weight gain: 35 percent Cited as main reason for weight gain: 43 percent And for more helpful health information, sign up for our daily newsletter. Cited as main reason for weight gain: 64 percent RELATED: There’s a New Reason You Can’t Lose Weight, According to Science.