Over 8–10 mmol/l: It’s normally impossible to get to this level just by eating a keto diet. It means that something is wrong. The most common cause by far is type 1 diabetes, with severe lack of insulin. Symptoms include feeling very sick with nausea, vomiting, abdominal pain and confusion. The possible end result, ketoacidosis, may be fatal and requires immediate medical care. Learn more
On a high-fat ketogenic diet, you can easily eat 3,000 calories or more daily with high-calorie foods like cheese and nuts. Sure, your body will shift into ketosis on a high-fat diet, but eating too many calories means your body will utilize dietary fat instead of body fat. A food journal can help you pinpoint high-calorie foods that might sabotage your weight loss. You don't need to be on an old Atkins diet plan to lose weight the keto way.
Day 10: I'm starting to get sick of the same foods that I know are safe bets. And the number of times I've Googled: "Is _____ keto?" is getting out of hand. I've realized that the only real gripe I have with the keto diet is that there are so many healthy, nutritious foods that you can't eat while on it. (Maybe that's why experts say you should give up restrictive diets once and for all.) Carrots? Sweet potatoes? Brussels sprouts? What vitamins and nutrients am I missing out on by leaving these foods off my plate?

And monounsaturated fat isn't the only thing olive oil has going for it nutritionally. Some olive oils come with phytonutrients that may offer their own disease protection benefits (still, it's not clear whether most of us can take in enough of these phytonutrients without going overboard on olive oil, says Joyce Nettleton, DSc, RD, researcher and editor of the PUFA Newsletter).

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