On Monday evening, an 80-kilo man steps onto his weighing scale and receives a complete fitness plan. Eight thousand steps. Up to 1,920 calories. Up to 160 grams of protein. Exactly 3.2 litres of water. The bathroom has acquired a doctor, though it hasn’t asked about his knees yet.
The viral formula multiplies body weight in kilos by 100 for daily steps, 22–24 for calories, 1.6–2 for grams of protein and 40 for millilitres of water. It also suggests losing 0.5–1% of body weight each week. Five calculations, and the mystery of human health appears ready for the family WhatsApp group.
Let us call our imaginary man Ravi. At breakfast, he wonders whether 1,920 calories are enough. His weight alone cannot answer that. His age, height, activity and health all influence how much energy he needs. Multiplication gives him a precise figure, but it doesn’t show whether it creates a suitable calorie deficit.
The figure might happen to suit Ravi. It might also leave him exhausted. For another person of the same weight, it may not create a deficit at all. A formula can get the answer right by accident; it cannot tell you when it has.
Ravi normally walks about 3,000 steps a day. On Monday, determined to reach 8,000, he takes an unusually long walk. By evening, he is pleased with himself. On Tuesday, his knees are less enthusiastic.
He could instead add a short walk after lunch and gradually increase his activity, based on his comfort. If walking hurts or his mobility is limited, the plan needs adjusting. Tomorrow’s ability to move matters too.
The steps equation has another curiosity. If Ravi loses 10 kilos, his target drops to 7,000. His heart hasn’t asked for a shorter walk; the calculator has simply been given a smaller number.
Walking can benefit health even when the scale is slow to respond. A 2025 review found that people taking around 7,000 steps daily had a lower risk of death during follow-up than those taking 2,000. The finding was an association, not a guarantee or a compulsory weight-loss target. Ravi’s health can improve before his trouser button agrees to cooperate.
At dinner, Ravi considers his protein target. Adequate protein helps preserve muscle during weight loss; resistance exercise helps too. The suggested 1.6–2 grams per kilo may suit some exercising adults, but needs vary. Kidney disease calls for individual advice.
He might begin by adding a suitable protein source—dal, curd, eggs, fish, paneer or soy—to a meal that lacks one. A supplement can help some people, but it need not be his first purchase. And 100 grams of paneer does not equal 100 grams of protein; the packet contains other things besides the figure on Ravi’s chart.
His water target needs context too. Heat, activity, and health affect fluid needs, and food and other drinks also contribute. Forcing extra water will not wash away fat. Some heart or kidney conditions require fluid limits.
For Ravi, the proposed weekly loss is 400–800 grams. That is a possible range, not a pass mark. Early changes can include water and fat, and progress will not be identical every week.
By Wednesday, Ravi has missed his step target, eaten lunch late and received a wedding invitation. He doesn’t need to start again on Monday. He can take a shorter walk after dinner, enjoy the wedding meal and return to his routine the next day.
A useful plan leaves room for days like this. It changes when Ravi’s knees hurt, when his work shifts change and when the numbers stop making sense. Anyone can forward a formula. The real test is whether Ravi can live with it and live well.
