That is, eat eggs in the morning, rice and a kind of meat (beef, chicken and pork) at noon, cucumber, tomato and pitaya at night until you are full at night.

I don't know what this cucumber is, but cucumber.

Eggs in the morning should be boiled, not yolk (or just one egg). You can eat protein at will, and you can ensure the supply of 90 grams of protein. Eating protein won't make you gain meat.

You can eat meat at noon, but you can't eat oil It's best not to eat rice. Too many carbohydrates are not conducive to losing points, so yogurt can be used instead. Moreover, the meat should be limited to150g, and only lean meat can be used. You can eat beef with sauce and make diced chicken with seasoning (no oil).

You can eat these at night, but pitaya is limited, and its sugar and calories are a little high.

The reason why you are thin is that you consume 2000 calories a day, while protein only provides a small part. When you consume 90 grams of protein, other protein will not participate in the heat supply and will not be converted into sugar and fat, so you can eat more protein, but you can't touch starch, sugar and fat. The menu above is only about 800 calories a day, but about 900 calories can lose 2 pounds of fat. You can lose 9 pounds if you persist in this way for one month.