There should be many factors. First, the race and foundation are solid. Russian women are white, and their genes determine that they are prone to gain weight in adulthood. The second is the climate. Russia is in the northern hemisphere, and most of its territory is in temperate and cold zones. It is difficult to cope with cold weather without a certain amount of fat; The third is diet. Russians have a meaty diet, heavy oil and the habit of drinking to keep out the cold, which also makes them easy to get fat.