Cardiologist, Arthur Agatston designed the South Beach Diet. He detailed the nutritional program in his best-selling book, "The South Beach Diet: The Delicious, Doctor-Designed, Foolproof Plan for Fast and Healthy Weight Loss." According to MayoClinic.com, you only derive 10 percent of your total daily calories from carbohydrates during the first phase. When you move into the second phase, you increase your carbohydrate intake to just 27 percent of your total calories. Vastly reducing your carbohydrate consumption can cause harmful effects to your body, so consult your doctor before vastly lowering your carbohydrate intake.
Insufficient Energy
Your body uses carbohydrates for energy, according to MedlinePlus, a service of the U.S. National Library of Medicine. You are basically eliminating carbohydrates from your diet in the first phase, so your body doesn't have sufficient energy sources. This is somewhat of a shock to your body so you may experience significant drowsiness. You should plan accordingly during the first phase and not overexert yourself to avoid excessive caffeine or other artificial energy supplementation. Your energy should return by phase two; however, your carbohydrates are still substantially low during this phase so you may have energy droughts throughout the day.
Low Fiber
Carbohydrates are the primary sources of dietary fiber. You body derives fiber from carbohydrates such as whole grains and vegetables. During phase one you may receive insufficient dietary fiber, so you should replace it for the time being with supplemental fiber, that can be added to water or meals. Low fiber can cause, constipation, diarrhea and nausea, according to MayoClinic.com.
Ketoacidosis
The first two weeks of the South Beach Diet can leave you at risk for ketoacidosis. This condition takes place when your body doesn't receive enough glucose for energy, so you can not sufficiently break down fats. Partially broken down fats are called ketones and can lead to a build up of uric acid in your body. If left uncared for, ketoacidosis can lead to feeling light headed, low energy, coma, stupor or death.
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