Drinking strong coffee before exercising increases fat-burning, new study finds

> Subjects ingested 3 mg/kg of caffeine or a placebo at 8am and 5pm

3mg/kg is over 250mg of caffeine for an average weight man. Twice a day makes that 500mg.

An 8.4oz can of Red Bull contains 80mg of caffeine. They were giving these people an amount of caffeine equivalent to 6 cans of Red Bull. Not a perfect comparison because Red Bull contains other ingredients, but that's still a lot of caffeine. For another point of reference, that's 2.5 shots of 5 hour energy (200mg caffeine per bottle).

To top it off, the subjects were caffeine-naive, so they had no caffeine tolerance. They must have been feeling extremely energetic.

No wonder they burned more fat. I'm not sure this is going to translate to your casual coffee drinker or someone with a high caffeine tolerance.

Almost seems like you're trying to sensationalize it by changing it to Red Bull, something that's actually pretty low in caffeine once you put marketing aside.

How about comparing it to Starbucks' regular hot coffee sizes?

- Short - 180 mg

- Tall - 260 mg

- Grande - 330 mg

- Venti - 415 mg

Is drinking a 12oz Tall at Starbucks really dropping your jaw?

Yes drinking two 12oz Talls at Starbucks every day is not good for your sleep.

Nespresso capsules have 60g for reference.

Source? I drink a fair amount of coffee every morning (not any after 10am) and never had any sleep issues. The half life for caffeine is somewhere around 6 hours, no?

Anecdata, but one tall (actually, even one short) at 8am will typically postpone the time I fall asleep by 4 hours and will typically reduce my sleep by an equal amount (i.e., I wake up at the same time despite falling asleep later).

I’ve run some experiments on myself, and this lasts for days at a time with one tall in the morning. If I keep at it for several days, I will crash early one evening, but still only sleep for 4 hours. It’s a nightmare for someone who typically sleeps 8 hours a night — I just feel fog-brained all the time. That said, workouts are super easy.

If I had a tall in the morning and evening on a regular basis, ugh... I can’t even imagine. I did this once for extra energy during a sports tournament (we won), but I basically had to drink myself to sleep each night.

Multiple doctors have told me that caffeine sensitivity varies from person to person, but I am on the unusually sensitive side.