At 4:40 PM on a humid Bangalore evening, a software engineer sits across from me clutching a steel flask like evidence. He looks mildly offended before I ask anything.
“Doctor, I drink water,” he says quickly. “See, I brought it.”
He has not touched it.
He has, however, finished two cups of coffee before noon, skipped breakfast, eaten a bun on the way, and attributed his back pain to his chair, his deadlines, and his genetics. Water, according to him, is innocent.
This is how dehydration walks into clinics now—not collapsed. Not dizzy. Perfectly upright. Well argued. Mildly offended.
No one arrives saying, “Doctor, I don’t drink water.” That would be too honest. They come with more pronounced symptoms—constant hunger, joint pain, afternoon fatigue, and stubborn weight gain. Thirst has learned to lie, and we have become excellent at believing it.
Most people assume dehydration is associated with heatwaves, construction sites, or marathon runners. That belief is wrong. Most dehydration today is behavioural—air-conditioned offices, back-to-back meetings, fear of office toilets, and caffeine standing in for breaks. We don’t sweat much, so we don’t feel thirsty. The body adapts. Quietly. Poorly.
If thirst were reliable, dehydration wouldn’t exist. Thirst is not an early warning. It’s a late notice.
Mild dehydration—just a 1–2% drop in body water—has been shown to reduce attention, memory, and mood. Not dramatic enough to rush to the hospital. Just enough to make you slower, duller, and irritable. Enough to call it stress and move on.
Hunger is dehydration’s favourite costume. The brain’s hunger and thirst centres are located close together and share neural circuitry. When water drops, the brain sends a vague alert. You interpret it as hunger. You eat. The body wanted water. It got calories. Digestion is more intense, blood sugar fluctuates, and hunger returns.
I tell patients this, and they nod thoughtfully. Then one asks, “Doctor, so fruits count?”
“Fruits help,” I say. “But your kidneys still want water. They are very old-fashioned.”
Joint pain follows next. Most people attribute the problem to age, stairs, office chairs, or the roads in Bangalore. Few blame water. Cartilage is mostly water. When hydrated, it behaves like a cushion. When dry, it behaves like a scrub pad. A dry joint doesn’t glide. It complains.
Think of it like a cycle chain. It will move without oil. But you’ll hear it. Over time, it wears more quickly.
Fatigue is dehydration’s most convincing lie. Low water means lower blood volume. The heart works harder. Oxygen delivery becomes less efficient. The brain, greedy and sensitive, is the first to slow. You feel foggy by the afternoon. You reach for coffee. The cycle deepens.
One patient once told me proudly, “Doctor, I don’t get thirsty at all.”
“That’s not fitness,” I said. “That’s poor notification settings.”
Urine, meanwhile, provides the most accurate laboratory report you already own. Pale yellow means balance. Dark yellow indicates the body is conserving energy, as in BESCOM during peak summer. Many panic after vitamin B-complex turns urine neon. Relax. That’s a vitamin fashion show, not dehydration. But consistently dark urine without supplements is a warning most people scroll past daily.
Weight gain surprises people the most—dehydrated cells slow metabolism. At the same time, thirst triggers cravings—especially for salty and sugary foods. Research repeatedly shows that people who drink water before meals eat less without trying to diet. Those who lose significant weight and keep it off almost always share one boring habit: they drink water regularly.
Not lemon water. Not detox water. Just water.
There are cultural barriers we rarely name explicitly.
“I don’t want to use the office toilet.”
“Too much water will damage the kidneys.”
“Cold water gives me a cold.”
“AC mein thirst nahi lagta.”
Let’s be clear about one thing: drinking water does not damage kidneys. Ignoring thirst does.
Age adds another twist. Thirst sensation declines with age. Elderly patients don’t feel thirsty even when dehydrated. That’s why dehydration presents as confusion, constipation, dizziness, or recurrent infections. Children, on the other hand, forget to drink while playing. Different ages. Same neglect.
Ayurveda understood this long before lab values. Dryness is not a disease. It is a state. When rasa—the body’s nourishing fluid—runs low, systems don’t collapse. They roughen. Lubrication fades. Flow resists.
How much water is sufficient?
Patients always want a number. I give them one that doesn’t demand devotion.
Think simple.
Roughly 30–35 ml per kilogram of body weight per day, adjusted for heat, sweating, and activity. Not an exact science. Just a steady baseline.
If you weigh 60 kg, your body typically uses approximately 1.8-2 L per day.
If you weigh 70 kg, estimate 2-2.3 litres.
More if you sweat, walk a lot, or live inside Bangalore traffic without mercy. Less if the weather is kind and the body is calm.
The mistake people make is not to account for the total. It’s the timing.
They drink minimally throughout the day, then suddenly remember water after dinner. Hydration doesn’t work like exam revision. The kidneys notice. Sleep suffers. The body wanted rhythm, not a last-minute apology.
Sip through the day. Don’t gulp.
Let water arrive quietly, as nourishment prefers.
Consistency beats heroics. The body absorbs water best when it arrives steadily, not in sudden floods.
I say all this while sometimes forgetting to drink water myself between patients. Experience doesn’t make you immune. It just makes you honest later.
Water will never compete with coffee for attention. It has no personality. No marketing. No reels.
It just keeps cartilage smooth, blood moving, neurons firing, appetite honest, and fatigue from lying too convincingly.
Tomorrow, watch the order. Coffee before water is not a preference. It’s a warning. The body doesn’t collapse. It erodes—cup by cup.
I have written a book.
If this blog spoke to you, the book will stay with you longer.
