From 55% to 70% of what we eat goes to the needs of metabolism. According to Hermann Pontezer, an evolutionary anthropologist from the United States, the metabolism is the intermediate amount of cell activity during the day. The calculation of the total energy consumption says not only how many calories are needed to stay alive, but also how well the organism is functioning. Recently Pontzer and over 80 of its co-authors published an article in which it has shown that much of what we know about metabolism is not true.
The metabolism of the newborn reminds the exchange of substances of an adult, installed the authors. Then, about a month, the metabolic rate begins to grow sharply until about 9-15 months, it does not increase by 50% compared with the metabolism of an adult (this is as if an adult burned 4000 calories per day at a rate of 1600-2400 for women and 2000-3000 for men).
Between the year and the two energy costs begin to decline, and it continues to about 20 years. And over the next 40 years, they remain at the same level, even during pregnancy and menopause. In 55 calories burn the same effectively as in 25.
Then, about 60 years, energy costs begin to decline, and fall until the end of life.
The size and variety of samples allowed scientists to see the overall pattern of change of metabolism with age. Nevertheless, there is a huge scatter in the metabolic rate among individual people. This means that there are a number of other factors, such as genes or lifestyle, which lead to the fact that the people of equal weight and type of physique, with similar habits spend different amounts of energy.
Understanding the natural stages of changes in metabolism should help scientists to adjust existing health standards for different ages.
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