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Police cited the Delhi High Court’s order on Wangchuk’s health while taking the activist to Safdarjung Hospital. The High Court had on Thursday had told the Union and Delhi governments to ensure regular monitoring of Wangchuk’s health and to “intervene immediately” if required.

The hospital said in a statement that Wangchuk was weak owing to prolonged fasting and dehydration. “Although he is currently stable, he requires continuous observation, monitoring and treatment to restore his body parameters,” it said.

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Even with electrolyte water, you do not get protein, essential fats, vitamins and calories. Electrolytes help reduce the risk of sodium, potassium, or magnesium imbalances, but they do not prevent starvation. As for weight loss, a person may lose 8-15 kg over 20 days.

A big challenge when it comes to long fasts is a condition called starvation ketoacidosis.

“When there is a lack of calories, the body starts utilising protein reserves. When the proteins are broken down, ketones are produced as a byproduct. This changes the pH of the body, which is linked to several bodily processes all of which get affected. The body produces so many ketones that they accumulate and make the blood acidic,” said Dr Tripathi, adding that this condition may turn fatal if not reversed quickly.

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Dr Hans Raj, former head of medicine department at Delhi’s Dr Ram Manohar Lohia Hospital, said: “Fasting for long durations can lead to all bodily and metabolic functions slowing down. The BP falls, the pulse rate falls, and the kidney deteriorates. It can also lead to starvation ketoacidosis. In such a state, the patient requires immediate hospitalisation. They have to be given nutrition through a nasal tube and hydration through IV fluids. The salts have to be balanced immediately and underlying conditions have to be monitored.”

Muscle loss continues despite ketosis, metabolism begins to slow to conserve energy, weakness becomes more noticeable.

Dr Tripathi said that the nasal feeding tube does not lead to any complication per se, and can sustain a person for days and weeks. “However, when the tube is being inserted it can cause some injuries in the windpipe or food pipe if forced.”

One of the greatest dangers comes after the fast. Suddenly eating a normal meal after 20 days can trigger “refeeding syndrome”. This refers to shifts in electrolytes — especially phosphate — that can cause heart failure, seizures, breathing problems. This can even be fatal.

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Refeeding is a gradual exercise and has to be medically supervised, said both doctors quoted above. Refeeding should begin with small, easily digestible meals and calories should be increased slowly over several days while ensuring adequate fluids, vitamins (particularly thiamine), and electrolyte monitoring.

Many people can survive 20 days without food if they have adequate body fat and continue drinking fluids with electrolytes. However, survival is not the same as safety.

The risk of serious complications rises with the duration of the fast, and some people may experience life-threatening complications much sooner. Those at greater risk include people who are underweight, pregnant, elderly, have diabetes, heart or kidney disease, or take certain medications.