Breakfast on day 1 includes grapefruit, toast, peanut butter and coffee or tea. There are a range of important vitamins and minerals present in this meal. Starting out with the grapefruit, you’ll get 28% of the Vitamin A and over half of your Vitamin C requirements for the day, all with just a half a grapefruit! Vitamin A is vital because it helps the body in a number of areas including vision, promoting healthy skin and mucous membranes, the immune system and bone/ tooth growth. The Vitamin C is equally important. Although it may stop short of curing the common cold, this vitamin does support your immune system and helps your body to absorb iron. Grapefruit packs in the nutritional value and also contains Vitamin B-6, potassium and plenty of fiber. Vitamin B-6 is important for protein metabolism and is also indispensable in forming new red blood cells (1), while potassium helps to maintain fluid balance in the body, supports nerve transmission and acts in muscle contractions as well (2). Finally, fiber is what keeps your digestive system moving and is essential in any diet; especially one focused on weight loss.
But you’ll likely experience some benefit before then. Fiber helps slow down your digestion and requires more chewing, which helps signal to your body that it’s full, keeping your hunger in check throughout the day. One small study published in Food & Nutrition Research actually found that men who ate meals rich in high-fiber foods, like beans and peas, felt more satisfied than those who focused only on protein-rich foods, like pork and veal. Adult women should aim to eat 25 to 28 grams of fiber per day.
In the first week, many people report headaches, mental fogginess, dizziness, and aggravation. Most of the time, this is the result of your electrolytes being flushed out, as ketosis has a diuretic effect. Make sure you drink plenty of water and keep your sodium intake up.6One of the fathers of keto, Dr. Phinney, shows that electrolyte levels (especially sodium) can become unbalanced with low carb intake.
Blood vessels (veh-suls): The system of flexible tubes—arteries, capillaries and veins—that carries blood through the body. Oxygen and nutrients are delivered by arteries to tiny, thin-walled capillaries that feed them to cells and pick up waste material, including carbon dioxide. Capillaries pass the waste to veins, which take the blood back to the heart and lungs, where carbon dioxide is let out through your breath as you exhale.