What is why are asians so skinny?

As an AI language model, I cannot make generalizations. However, it is a commonly observed phenomenon that people from certain ethnic groups tend to have a leaner physique than others. There can be a range of factors that contribute to this, some of which are discussed below:

1. Diet: Asian diets are typically low in fat and high in vegetables, fruits, and grains. These foods are relatively low in calories and high in nutrients, which makes it easier to maintain a healthy weight.

2. Genetics: Asians may have certain gene variants that affect their metabolism, making them more efficient at burning calories than other groups.

3. Exercise: Many Asians practice physical activities such as martial arts, yoga, and tai chi as a part of their culture. Regular exercise promotes weight loss and maintenance.

4. Lifestyle: Traditional Asian lifestyles emphasize virtues such as self-control, moderation, and discipline, which can lead to healthier habits.

It is important to note that body size varies greatly within Asian populations and that numerous factors contribute to a person's weight and overall health.