On the third day after heart bypass surgery, you should eat a low-salt, low-fat diet, keep your diet light, and consume some high-quality protein as appropriate. After heart bypass surgery, patients should have a low-salt, low-fat and light diet. In addition, they should try not to consume food with high cholesterol content, such as animal offal, egg yolk, all kinds of fish roe, etc. They can replenish their energy by consuming some high-quality protein-rich food, such as protein powder, low-fat milk, fish and tofu. It should be noted that, in order to facilitate the digestion and absorption of the gastrointestinal tract, each meal should not be too full, seven minutes of satiety can be, which also helps to reduce the burden on the heart. After heart bypass surgery, patients should maintain a reasonable diet under the guidance of the doctor, not overeating.