The reason is diet. For example, in China, people eat three meals a day. Nobody eats meat every day. Ordinary people eat vegetables almost every day at home. Only on holidays do they eat big fish and meat. Our breakfast is generally light, and no one eats high-calorie and greasy food in the morning.
Foreign countries are different. They are more like meat eaters. Meat is the indispensable food for three meals a day. Like working people, what they eat the most every day are those high-calorie fast food. Such as hamburgers, French fries, fried chicken, these are the reasons why people get fat.
More importantly, in China, the most abundant meal is Chinese food, and dinner is generally less. Foreign countries are different. The most abundant thing they eat in a day is dinner. Because only in this way can I enjoy my life. Eating too much at night will make you fat.
This is why China people look slimmer than foreigners.