Interesting nutrition experiment

  Nutrition is an experimental subject that derives from life practice and guides life practice. Through well-conceived experiments, scientists have discovered many important principles. Here are some interesting experiments that have been done in the history of nutrition research.
  Large scale study of
  people who need food to survive, but the food in the body is how to change it? In the 16th century, the famous Italian doctor Santorris made a big balance, hanging on the beam of the ceiling of the study, with a chair at each end. He sat in a chair for several days, observing and recording changes in weight. The weight will of course increase after meals, but after a few hours the weight will gradually decrease, and the number of relief will greatly exceed the total amount of excreta. He believes that the excess is evaporated in the form of sweat that people cannot see. Later, people learned that food is metabolized by energy in the body, turning into water and carbon dioxide, and releasing heat.
  Guinea pig on ice cubes In
  1780, the French chemist Lavoisier made a bell-shaped container for observing the chilled body temperature of guinea pigs. He found that this process is very similar to the process in which charcoal combustion melts the ice and both consume oxygen and release carbon dioxide. Five years later, he asked a young colleague to do experiments, which confirmed that when people work in a cold environment, they emit more calories, consume more oxygen, and need to eat more food. Lavoisier pioneered the study of nutrition and was later hailed as the “father of nutrition”.
  A hole in the stomach only
  young Canadian boatmen St. Martin in an accident was hit by rifle abdomen, after recovery by the US surgeon Bo Mengta surgery, but leaving a 1 cm diameter hole on the stomach can not be healed. After obtaining Martin’s consent, Bomonta used this porous stomach for 8 years of digestive physiology experiments and published an important digestive physiology thesis in 1833.
  Sailor’s diet
  For a long time, there has been a terrible vitamin C deficiency in the sailors of the voyage, which will seriously kill people. There is a tradition among some captains: eating sour foods can prevent this disease. In 1747, the US Navy military medical Linde divided the sick sailors into six groups, which were treated with citrus, lemon, dilute sulfuric acid, vinegar, sea water and drugs. After the experiment was carried out for 6 days, the first two groups of sailors recovered, and the other groups had no effect. But at the time, people did not believe that simply using food could prevent disease. Until the death of Linde, the Royal Navy ruled that lime must be part of the sea food of the crew.
  Rice feeding chickens
  In the 1980s, Sumatra and Java were colonies of the Netherlands. The beriberi was very serious in the local prison, so the Dutch sent a famous medical team to treat. They thought that beriberi was caused by bacteria, so they were trying to find bacteria from food and patient’s excrement, but they found nothing.
  Later, Dr. Ekman in the squad stayed to continue the study. He experimented with chickens, because chickens fed with the rice left by the prisoners had similar symptoms of neurosis. An accident happened at this time: the new prison director did not allow the chicken to be left with the leftovers, and the experimenter had to buy rice to feed the chicken. I didn’t want to be beaten, and the sick chickens recovered their health after eating unpeeled rice. Ekman started a new study and finally discovered that rice bran contains anti-neuritis substances, and he won the Nobel Prize in Medicine.
  Quality protein
  Some farmers found that feeding animals with different food sources of protein, they are not the same effect of weight gain.
  In 1911, American scientists Osborne and Mendel made an experiment: milk protein, wheat protein and zein were used to formulate feeds with a protein content of 18%. Results The first group of rats grew well and the weight gain was normal. The weight of a group of white mice fed with wheat protein did not increase; while the weight of the last group of rats decreased, and the time was long and even died. The two scientists thus initiated research on protein quality and found that the protein amino acids of different food sources are different, and the effects of absorption and utilization by the body are different. They classify proteins into complete, semi-complete, and incomplete proteins to show differences in their quality.
  It is these ingenious experiments by scientists that promote the development of nutrition, enlighten people and protect our health.