Зачем пьют воду?

Вот уж, кажется, простой вопрос. Такой простой, что и спрашивать не зачем. А спросишь, и оказывается, что из десяти человек только один знает, зачем пьют воду.

Вы скажете: воду пьют потому, что хочется.

А почему хочется? Потому что без воды жить нельзя.

А жить нельзя потому, что мы воду всё время расходуем и нам надо запас её пополнять.

Дыхните-ка на холодное стекло. Стекло запотеет, покроется капельками воды.

Откуда взялась вода? Из вашего тела. Или вот, скажем, вы в жаркий день вспотели.

Откуда взялся пот? Опять-таки оттуда же из тела.

А раз вы воду расходуете, теряете, вам нужно ею время от времени запасаться.

В сутки человек теряет целых двенадцать стаканов воды. Значит, столько же ему надо выпить или съесть.

А разве воду едят?

В том-то и дело, что едят. В мясе, в овощах, в хлебе во всякой еде воды гораздо больше, чем твёрдого материала. В мясе воды втрое больше, чем твёрдого вещества, а огурец, так тот почти целиком состоит из воды.

Да и в вас самих воды почти столько же; сколько в зелёном огурце. Если вы весите 40 килограммов, то в вас 35 килограммов воды и только 5 килограммов твёрдого материала. Тело взрослого человека содержит воды меньше: около трёх четвертей веса.

Вы спросите:

— Почему же люди не растекаются по полу, как кисель?

Если мы рассмотрим под микроскопом кусочек мяса или огурца, мы увидим множество клеточек, наполненных соком. Сок этот не выливается из клеточек потому, что они со всех сторон закрыты. Вот в чём секрет.

Значит, вода главный материал, из которого построено ваше тело. Неудивительно поэтому, что человек может долго прожить без еды, а без воды не может прожить и нескольких дней.



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