Plenty of fluids are part of the prescription for most illnesses, but doctors say that dengue patients need at least one litre  more than healthy people, who should have at least two litres  of water a day. This takes the recommended intake for dengue patients to at least 15 glasses of water a day.

Dengue patients need more water than usual because the disease is characterised by the capillary leakage syndrome, in which the water goes out of the arteries and veins and collects in various cavities.

This leads to haemoglobin concentration in the blood, which shows up in the haematocrit test. This test is the most important indicator of the dengue shock syndrome, which leads to a fall in blood pressure, increased stress on the vital organs and finally, multi-organ failure.

A healthy person’s water intake too depends on several factors such as the environmental temperature, level of activity, state of health, body surface area, and even diet. The need for water rises significantly with strenuous or prolonged physical activity and humidity.

In such conditions, some people may need twice the amount of water considered adequate for a sedentary person at lower temperatures.

Every weight-loss programme recommends drinking lots of water since it both fills you up and improves digestion.

Some people, particularly the elderly, may not feel thirsty easily, which puts them at a risk of dehydration.

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