I think the main reason is that its calorific value is not high, and its protein content is OK. Every100g of duck blood contains protein13g.

However, it is also beneficial for fitness people to eat duck blood properly, because duck blood is also rich in protein, a variety of amino acids and trace elements that cannot be synthesized by human body. It also has the effects of enriching blood, clearing away heat and toxic materials.

Moreover, the composition of duck blood is different from that of chicken breast, and the help to bodybuilders will be different.

Chicken breast, which bodybuilders often eat, has a calorie of100g and a protein content of about 22g.

These two indexes are much higher than the content of duck blood.

In addition, the muscle growth of fitness crowd is inseparable from amino acid nutrition. protein in chicken breast can be decomposed into amino acids, which can promote muscle synthesis. Chicken breast contains carnosine and troponin, which can reduce the production of lactic acid in muscles, improve the fatigue problem of the body, maintain abundant energy and enhance the fitness effect.

There is also the price of chicken breast is also affordable, only a few dollars a catty.