Hot coffee or cold coffee? Which should you drink this summer

Scorching afternoons and heatwave alerts have become routine across Indian cities this summer. And for coffee drinkers, the question follows naturally: does your usual hot cup need to go, or is the iced version actually better for you when temperatures cross 40 degrees?

The short answer is that neither format is categorically superior. The more useful question is what your body tolerates, and how much you are drinking.

Hot and cold coffee made with milk share a broadly similar nutritional profile. The caffeine content, the protein from the milk, the caloric load — none of these change significantly based on temperature. What does change is how your body feels after consuming them, which varies considerably from person to person.

More from Lifestyle

Cold coffee tends to feel more immediately refreshing, particularly in the afternoon. But for people with sensitive digestion or lactose intolerance, cold beverages can cause bloating or discomfort. Warm fluids, counterintuitively, are often easier on the stomach and may help stimulate digestion, particularly in the morning.

Caffeine is mildly diuretic, which means it encourages the body to lose fluid. During a heatwave, when dehydration risk is already elevated, this is worth keeping in mind. The practical advice is not to cut coffee entirely, but to limit intake to one or two cups a day and to continue drinking water consistently through the day. Nimbu paani, coconut water, and electrolyte drinks all help maintain fluid balance during extreme heat.

The case for hot coffee is not entirely gone

There is some evidence, though not conclusive, that hot beverages can assist in cooling the body down. The mechanism is sweat: heat from a hot drink can trigger perspiration, and as sweat evaporates, the body temperature drops. A 2012 interview with University of Cambridge neuroscientist Peter McNaughton flagged this effect, with one important caveat — it works in dry heat, not humid conditions. In the sticky, humid summers of coastal cities or monsoon-adjacent weather, the sweat may not evaporate efficiently enough for the cooling effect to register.

What to watch with cold coffee

If you are switching to cold coffee, the more relevant concern is not temperature but what is in the cup. Cafe-style cold coffees and bottled frappes often carry significant amounts of added sugar, cream, and syrup. During extreme heat, a heavy, sweet drink tends to feel worse, not better. A homemade version with skim milk and minimal sugar is a lighter option.

There is no rule that requires swapping hot coffee for cold when summer arrives. If warm coffee sits fine with your digestion and your daily intake stays within a cup or two, there is no particular reason to change the habit. If cold coffee feels better, keep it simple. In either case, what matters more than the temperature of your coffee is how much water you are drinking around it.