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Many people believe they are suppose to drink eight glasses of water a day, or about 【S1】______
two liters. What?Because that is what they have been told all their life.But a new report【S2】______
offers some different advice. Experts say people should obey their bodies; they should
drink as much water as they feel like drink. 【S3】______
The report contains some general suggestion. The experts say women should get
about two-point-seven liters of water day. Men should get about three-point-seven liters.【S4】______
But wait--in each case, that is more than eight glasses.
There is an important difference. The report does not tell people how many glasses
of water to drink. In fact, the experts say it may be possible to know how many glasses 【S5】______
are needed to meet these guidelines. This is because the daily water requirement can
include the water content in foods.
People need to drink more water when they are physically active.The same is true
of those live in hot climates.Depending on heat and activity, people could need two times【S6】______
so much water as others do. 【S7】______
All this, however, docs not answer one question. No one seems sure why people
have the idea that good health require eight glasses of water daily. 【S8】______
It may have started with a misunderstanding. In nineteen-forty-five, the National
Academy of Sciences published some guidelines. Its Food and Nutrition Board said a
good number of water for most adults was two-point-five liters daily. This was based on 【S9】______
an average of one milliliter for each calorie of food eat.But that was only part of what【S10】______
the board said. It also said that most of this amount is contained in prepared foods.
【S1】