Have you ever heard of "negative food" This word is quite fashionable recently. In some people's mouths, this kind of food is magical. After eating, not only will it not increase the energy reserve of the human body, but it will consume energy, and the more you eat, the lighter your weight will be. On the negative energy food list, there are 25 kinds of foods such as apples, celery, cabbage, papaya and lettuce. ?

What do nutrition experts say: The so-called "negative energy food" does not exist. Most of the foods recommended on the Internet are plant foods with low energy and rich dietary fiber. If you still promote weight loss under the banner of "negative energy", it will be even more unreliable. ?

Can't find relevant academic articles?

In fact, the concept of "negative energy food" appeared about ten years ago. It does not refer to food with energy less than zero, but refers to food that requires more energy for digestion than it can provide. ?

One of the basic functions of food is to provide energy for people's daily activities. However, people also consume some energy during eating, such as chewing, swallowing, digesting and absorbing. If the energy consumed in digesting a food is greater than the energy provided by the food, for example, 100 grams of food provides 80 kilocalories, but it takes 100 kilocalories to digest this food, then the energy effect produced by this food is -20 kilocalories, which is the theoretical basis of "negative energy food". This theory seems impeccable, and it is really attractive to lose weight while eating. However, is there really "negative energy food"? ?

Nutrition is meaningless?

"In plain language, seemingly scientific arguments are clear and fast, but they can't stand scrutiny." Li Shuguang, a nutritionist and professor at Fudan University School of Public Health, said that different foods have different energy values. Relatively speaking, the energy values of vegetables and fruits are relatively low, for example,100g of winter melon provides 9 calories,100g of celery provides12g of energy, and100g of onion provides 45 calories. Many fruits contain fructose, so the energy values are slightly higher, for example,/kloc-. An adult man needs to consume 2400 kilocalories a day. ?

So, how does this energy come in handy? Li Shuguang said that 60% to 65% of energy is used for basic metabolism of human body, such as heartbeat, breathing, thinking, gastrointestinal peristalsis, kidney filtration and so on. About 20% of the energy is used to maintain the normal study, activities and entertainment of human body, and about 65,438+00% of the remaining energy is used to meet the special dynamic functions of food, such as digestion and decomposition. Therefore, the energy for digesting food cannot exceed the energy provided by the food itself. "Negative energy food" doesn't make sense in nutrition. ?

If you want to lose weight, there are still two ways, either reducing energy intake or consuming energy through exercise. Here, celery is a negative energy vegetable, but it is only a low-energy plant food rich in dietary fiber.