There are several possible sources of nausea on a high-protein/low-carb diet.
Some that I've read about or have experienced:
Too few carbohydrates (this doesn't mean you have to eat bread and potatoes, but a little more low-carb vegetables can help). Personally, induction level (under 20g of carbohydrates) always makes me somewhat nauseous, but I have blood sugar issues and am on blood sugar lowering medications (which probably lowers my tolerance threshold). Find the carb-level that allows you to lose weight, but feel your best.
Too much fat. I find that high fat meats, or meats prepared with a lot of fat can sometimes leave me feeling like there's a big rock in my stomach.
Too little fat (especially if combined with too little carbohydrate) can cause nausea, headaches and in extreme cases worse (resulting in rabbit starvation - very interesting and dangerous condition, google it, or search on this site where it's been discussed).
Eating too much or eating too quickly. Because you're allowed unlimited portions, it can be easy on low-carb diets to initially overstuff yourself. Remember the goal of Atkins and other low-carb plans are to eat to satisfaction, not discomfort. Often, because it takes a while for satiety/fullness signals to process, if you eat quickly you can become overfull before realizing it. Eating slowly, and really paying attention to whether you are satisfied can really help.
Too little water: Water is essential for protein digestion (too little water and ammonia can build to dangerous levels). If you increase the protein ratio in your diet, you may need to increase your water level proportionally. I'm not saying you need to drink liters and liters of extra water, but increasing water a bit may help.
Last edited by kaplods; 09-21-2009 at 04:38 PM.
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