It’s hard to imagine that a physician recommended diet would be unsafe, but then again, doctors used to demonize fat, and are now actually recommending fat...pretty crazy when you think about it. But yes, the Ketogenic diet is safe, however, there are a few things to keep in mind when starting/being on the Keto Diet.
Firstly, when starting the diet you’ll most likely feel a bit dehydrated if you do not stay on top of your water intake (64 oz minimum). This is simply because glycogen, which is converted from carbs, holds approximately 2-3 grams of water per gram of glucose in the muscles’ cells. But by almost completely eliminating carbohydrates from your diet, your muscle cells hold much less glucose, and therefore, less water, ultimately leading to dehydration. So sufficient water intake is key throughout the diet.
Secondly, our bodies do obtain several key vitamins and minerals that are found in various fruits and carb sources, so it is critical to instead obtain these from low carb fruits, leafy greens, and if you like, a vitamin or multivitamin. If you are concerned about which vitamins or minerals your body could be deficient in, you can always speak to your doctor and request a blood analysis of your vitamin and mineral levels. Then with guidance from a nutritionist, supplement with one or multiple vitamins (this is better than just taking a standard multivitamin).
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When starting the Ketogenic diet, it is important to note that there are actually three different types, and depending on your lifestyle and preferences, one may be more enjoyable to follow.