Greek yogurt is an extremely satiating breakfast or snack, thanks to its thick, creamy texture and a whopping 17 grams of protein (nearly three times more than is in an egg, in fact). A study from the journal Appetite found that people who ate a high-protein yogurt snack three hours after lunch felt fuller and ate dinner later than the other participants. And on top of that, other studies suggest that the acids produced during yogurt fermentation might help increase feelings of fullness.
Basically, whatever you want — but you're only allotted 1,500 calories per day, so if you want to feel full, your best bet is sticking to healthy fare. The advantage is that instead of limiting yourself to the menu laid out for you on the first three days, you can divvy those calories up however you'd like. You can fill up on a salad, eat plenty of small fruit snacks throughout the day, or focus on your proteins. It's up to you and whatever you decide to make of it.
A survey in 2005 of 88 paediatric neurologists in the US found that 36% regularly prescribed the diet after three or more drugs had failed; 24% occasionally prescribed the diet as a last resort; 24% had only prescribed the diet in a few rare cases; and 16% had never prescribed the diet. There are several possible explanations for this gap between evidence and clinical practice.[33] One major factor may be the lack of adequately trained dietitians, who are needed to administer a ketogenic diet programme.[30]
While the diet as a whole may not be as varied as your regular diet, it does include enough rich and nutritious foods that it should meet your body’s basic needs. The diet only lasts three days, which means you’ll soon be able to eat a greater variety of foods that will fill in the gaps you’ve missed while dieting. If you were to keep following the diet, repeating the 3-day cycle over and over, you’d run into serious nutritional deficiencies.
From the whole wheat toast, you’ll get plenty of carbohydrates, fiber, iron, Vitamin B-6, magnesium and calcium. You’re probably familiar with most of these vitamins and minerals. Calcium of course is important for healthy bones and teeth. Magnesium is also found in the bones; but is needed too for creating protein. Iron plays an important role in blood, specifically, it carries oxygen in the body (2). That’s why iron deficiencies can cause you to feel tired, as oxygen may move more slowly throughout your body. The peanut butter will fill you up with 8 grams of protein and healthy fats. Finally, both coffee and tea are full of antioxidants and caffeine to give you a kick start in energy. As a result, you can confidently choose either coffee or tea. If you want to obtain additional health benefits, try drinking green tea.
Leanne Vogel is a nutrition educator and the creator of healthfulpursuit.com, the popular website for those searching to change their lives through a whole-foods–based keto program. Leanne has gained worldwide recognition for her unique “no-limits”, paleo-friendly approach to the keto lifestyle and is the go-to resource for those looking to achieve health, happiness, and body confidence through a high-fat, low-carb keto diet.

"When going out for fast food, I used to get the large-size value meal. Now, I satisfy a craving by ordering just one item: a small order of fries or a six-piece box of chicken nuggets. So far, I've shaved off 16 pounds in seven weeks, and I'm on track to being thinner than my high school self for my 10-year reunion later this year." —Miranda Jarrell, Birmingham, AL
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