Dr. Atkins, in the New Diet Revolution, cautions against caffeine because it has been shown to stimulate the release of insulin. For those of us with a lot of body fat to lose, and/or who have insulin resistance (eg. PCOS, type2 diabetes, Syndrome X) or who are metabolically resistant to ketogenesis, this could be a problem. It is very much a YMMV thing.
It's sometimes suggested, as Wa'il pointed out, if folks hit a stall after having lost a bit of weight, or they find they are no longer in ketosis.... that caffeine MAY be the culprit. Often, the problem isn't the caffeine per se, but the carb content ........ when trying to fine-tune ketosis Induction, and limiting the carb-intake to only 20 grams a day, a few cups of coffee can add up. According to Corrine Netzer's "Food Counts" book, one small 6-oz. cup has 0.8 carbs. Many of us use a 10 oz. mug. Add the carbs for the cream and any packets of sweetener ..... 3 mugs of java can rack up 5 or more carb grams before you know it!
Generally, most folks who really enjoy caffeine and the energy boost it gives.... will continue to do so with minimal adverse effect on the weight and fat loss effort. As well, having a caffeinated, lowcarb beverage can help stave off cravings for a major carb-fest. Flip-side, some folks report the caffeine TRIGGERS cravings. Every body is different.
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To answer another question you posted earlier, about fitness, muscle-building and cutting carbs, I found a series of articles written by Lyle McDonald on the subject at
http://musclemonthly.com/articles/0...d-body-talk.htm Lyle is the author of "the Ketogenic Diet", and I have a feeling you will likely find the answer to this and other questions there. Good luck ..
Keep us posted on your success
Doreen