Green tea and black coffee: what they do, and what they do not
Green tea does not burn meaningful fat: trials show well under 1.5 kg difference, and often none. Its real value is as a zero-calorie replacement for sweet chai and cold drinks. 2 to 3 cups a day is enough, taken between meals, because tea blocks iron absorption from daal and sabzi.
Caffeine in everyday drinks
| Drink | Serving | Caffeine (approx.) |
|---|---|---|
| Green tea | 1 cup (240 ml) | 25 to 45 mg |
| Black tea / chai (brewed) | 1 cup | 40 to 70 mg |
| Instant coffee | 1 cup | 60 to 80 mg |
| Brewed or filter coffee | 1 cup | 95 to 165 mg |
| Cola drink | 1 can | 30 to 40 mg |
Where green tea actually helps
- Replacing calories: two cups of chai with two teaspoons of sugar each carry about 120 calories a day; green tea has none.
- A habit instead of a snack: a cup at 5 pm instead of biscuits or nimko.
- Hydration without sugar.
None of this works if you add sugar or honey, or drink it with mithai. The drink is not the diet; see the full weight loss plan.
Black coffee: useful, but not magic
Black coffee has 2 to 5 calories a cup. Caffeine raises alertness and can improve workout performance, and regular coffee is linked in studies to a healthier liver. But a milky, sugary coffee from a cafe can carry 200 to 400 calories. If coffee gives you acidity, palpitations or poor sleep, cut back.
One Pakistani caution: tea and iron
Tea, green or black, reduces how much iron your body takes from daal, chana and sabzi, by as much as half when drunk with a meal. With anaemia so common here, especially in women, keep chai and green tea an hour away from meals. More on this in iron-rich foods.
See a doctor first if
- You get palpitations, tremor or bad sleep from caffeine
- You have acidity, reflux or stomach ulcers that worsen with tea or coffee
- You are pregnant (keep caffeine under about 200 mg a day)
- You are taking green tea extract supplements and feel unwell or your eyes look yellow
Common questions
Does green tea burn fat?
Barely. Trials of green tea or its extract show average weight loss of well under 1.5 kg over weeks to months, and many show no useful difference. Green tea is a good zero-calorie replacement for sweet chai and cold drinks, which is where the real benefit comes from.
How many cups of green tea a day?
2 to 3 cups a day suits most adults. Green tea contains caffeine (about 25 to 45 mg a cup), so too many cups can disturb sleep. Avoid high-dose green tea extract supplements; they have been linked to liver injury.
When should I drink green tea?
Between meals, not with them. The tannins in tea reduce iron absorption from daal, chana and sabzi, which matters in Pakistan where anaemia is common. Keep tea at least an hour away from main meals, and avoid it late at night.
Is black coffee good for weight loss?
Black coffee has almost no calories and caffeine gives a small, short-lived rise in metabolism and can improve exercise performance. It does not cause meaningful weight loss by itself. The calories come from the sugar, cream and syrups you add.
How much caffeine is safe in a day?
Up to about 400 mg a day for healthy adults, roughly 3 to 4 cups of brewed coffee. Pregnant women should stay under about 200 mg. Caffeine can worsen acidity, palpitations and anxiety in some people.
Does green tea help with diabetes or cholesterol?
Some studies show small improvements in fasting sugar and LDL cholesterol, but the effects are modest and not consistent. Treat green tea as a healthy drink choice, not as treatment.
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Sources
- Jurgens TM et al. Green tea for weight loss and weight maintenance in overweight or obese adults. Cochrane Database Syst Rev, 2012
- EFSA Panel. Scientific opinion on the safety of green tea catechins. EFSA Journal, 2018
- EFSA. Scientific opinion on the safety of caffeine, 2015
- Hurrell RF, Reddy M, Cook JD. Inhibition of non-haem iron absorption by polyphenol-containing beverages. Br J Nutr, 1999