Ketosis is one way the body can obtain energy from food. Usually, the body breaks down carbohydrates -- foods like bread, fruit, and starchy vegetables -- into glucose, which it uses for energy. Excess energy that comes from consuming more carbs than the body needs becomes fat. If the body does not have sufficient carbohydrates to burn for energy, it will enter ketosis and start burning fat, which is how a person loses weight. The ketogenic or keto diet takes this process one step further by all but removing carbs from the diet so the body begins exclusively burning fat for energy. Many people are adopting this way of eating, but it isn't a lifestyle into which someone should enter uninformed
Once a person is in full ketosis -- that is, once the body is exclusively burning fat to provide energy instead of carbs -- there will be elevated ketones in the blood. This may cause fruity or acetone-scented breath that will not be alleviated by brushing the teeth. Sugar-free gum can help disguise the smell, but it is important to check that it is acceptable on the keto diet. Most people report that smelly breath disappears within a few weeks.
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