Although Hamburg seems to have both staple food, vegetables and protein, the key point is that the ratio between them is not appropriate, so it is called junk food.
1. Bread embryo in hamburger.
Bread in hamburgers is refined carbohydrate, just like white rice and white noodles that we often eat in China, and it has a very high GI.
Foods with high glycemic index are particularly easy to digest and absorb in the human body. After eating this food, the peak blood sugar is high. In order to maintain blood sugar stability, islet cells secrete a large amount of insulin, which stimulates the glucose in the blood to be converted into fat and stored in fat cells.
At the same time, the enlargement of adipocytes will increase insulin resistance. Eventually, fat cells lose their insulin sensitivity, and blood sugar cannot enter the cells, thus leaving hyperglycemia in the blood (type 2 diabetes).
Another big problem of foods with high glycemic index is poor satiety, which easily leads to obesity. So you will be hungry soon after eating these refined breads, and you have to find other foods to fill your stomach, which virtually increases your extra energy intake.
2. All kinds of vegetables in hamburgers.
The vegetables in hamburgers, mainly lettuce and tomatoes, are really good. Most of them are raw and have not been cooked at high temperature, so vitamin C is well preserved.
But the amount is really too small (I didn't weigh it specifically. You can try KFC and McDonald's if you are interested. Visually, the total amount of vegetables shall not exceed 10g).
The reason why hamburgers put vegetables is because lettuce is one of the few raw vegetables and has no pungent smell of green leafy vegetables. Ask foreigners to put a leek in the hamburger. ......
However, the color of lettuce is light, and its nutritional value is far from that of rape (green vegetable), spinach and leek (mainly vitamin C, calcium and magnesium).