Those issues can be part of what's known as the “keto flu,” Warren says. Other side effects of the keto diet, all of which are tied to carb withdrawal, can include lightheadedness, nausea, mental fog, cramps, and headaches, in addition to tiredness. Luckily, the keto flu doesn't usually last more than a week—which is coincidentally about when people start to see the number on the scale go down, says Warren.
The remaining calories in the keto diet come from protein — about 1 gram (g) per kilogram of body weight, so a 140-pound woman would need about 64 g of protein total. As for carbs: “Every body is different, but most people maintain ketosis with between 20 and 50 g of net carbs per day,” says Mattinson. Total carbohydrates minus fiber equals net carbs, she explains.
Look at the glycemic index to choose the best foods for your ketogenic meal plan. There are websites that provide the glycemic index (GI) or glycemic load of different foods. The glycemic index tells you how your body's glucose and insulin system will respond to different foods. Foods that are lower on the index (or have a lower glycemic load) are foods that digest more slowly and will help you to feel full for a longer period of time.
Eggs are a healthy, nutrient-dense food that has been incorrectly maligned for years. Cholesterol in food doesn’t increase cholesterol in your blood, so eat eggs liberally – they’re packed with protein and lutein, and they fill you up for hours. Make a healthy omelet with some cheddar, crumbled breakfast sausage, and shredded spinach and you’re already looking at over 30g of protein, just for breakfast! Spinach is a great source of magnesium and potassium, too. Add some sea salt and you’ve got a big dose of electrolytes that are so vital to maintaining energy and staving off headaches. Get the recipe and instructions
High-Fat Cheeses — Although hard cheeses make for a great keto snack, they aren’t the best cheese for increasing your fat intake without getting too much protein. The highest fat cheeses that can serve as ideal high-fat, low protein snacks are mascarpone cheese and cream cheese. Feel free to combine them with other snacks in this article, such as pork rinds, pepperoni, and nuts, for a wonderfully tasty keto snack.
Achieving ketosis is a pretty straightforward, but it can seem complicated and confusing with all of the information out there.4If you want to learn more about ketosis and the scientific process around it, you can visit a very in-depth discussion about on Dr. Peter Attia’s website. Here’s the bottom line on what you need to do, ordered in levels of importance: