More Research That Caffeine Is Bad For You

Last modified on November 25th, 2007

I’ve posted a few times on this subject, but this is a new paper that’s hot off the presses. Once thought to help with weight loss, caffeine has recently been cast in a new light as actually contributing to weight gain. Even caffeinated diet pop can lead to weight gain, due to increased insulin secretion in the body.

A double-blind, randomized, placebo-controlled crossover study with periods of 7 days and washouts of 5 days comparing caffeine with placebo capsules was conducted. Participants were 16 healthy adults aged 18 to 22 years with a history of caffeine consumption. Blood samples from each subject were assayed for glucose, insulin, serum cortisol, DHEA, and androstenedione on the eighth day of each period after an overnight fast. Nighttime salivary melatonin was also measured. Insulin levels were significantly higher (by 1.80 muU/mL; 95% confidence interval, 0.33-3.28) after caffeine intake than after placebo. The homeostasis model assessment index of insulin sensitivity was reduced by 35% (95% confidence interval, 7%-62%) by caffeine. There were no differences in glucose, DHEA, androstenedione, and melatonin between treatment periods. This study provides evidence that daily caffeine intake reduces insulin sensitivity; the effect persists for at least a week and is evident up to 12 hours after administration.

Having excess insulin in your blood makes it hard for your body to break down fat, so in essence caffeine can slow weight loss efforts. You can read the whole paper here Beth.

5 responses to “More Research That Caffeine Is Bad For You”

  1. Anne says:

    Seems there’s no winning here. You can’t have caffeine because of the weight gain. So then you drink diet pop and the sweetener is also very bad for you. Is there nothing we can claim as a vice these days? lol.

  2. Beth says:

    Thanks, Duane! I’ll check that out! And that reminds me that there was another paper you suggested that I *completely* forgot to check out! My bad!

  3. Tawcan says:

    Hmm interesting, and the health magazines always suggest drinking green tea increases metabolism hence helps you lose weight…

    Love the new look!

  4. August Balls says:

    Dr. Robert C Atkins, MD (THE Atkins) stated in his 1992, book that caffeine raises insulin and is to be avoided on the Atkins Diet. I personally lost 18 pounds in one month by just eliminating caffeine.

  5. Duane Storey says:

    Did you maintain that? It’s pretty hard for the body to actually break down more than 2 pounds of fat per week, so I imagine a chunk of what you lost was water weight. But congrats.

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