Low-carbohydrate diet advocates including Gary Taubes and David Ludwig have proposed a "carbohydrate-insulin hypothesis" in which carbohydrate is said to be uniquely fattening because it raises insulin levels and so causes fat to accumulate unduly. The hypothesis appears to run counter to known human biology whereby there is no good evidence of any such association between the actions of insulin and fat accumulation and obesity. The hypothesis predicted that low-carbohydrate dieting would offer a "metabolic advantage" of increased energy expenditure equivalent to 400-600 kcal/day, in accord with the promise of the Atkin's diet: a "high calorie way to stay thin forever".
Severely restricting carbohydrates to less than 0.7 ounces (20 grams) a day can result in a process called ketosis. Ketosis occurs when you don't have enough sugar (glucose) for energy, so your body breaks down stored fat, causing ketones to build up in your body. Side effects from ketosis can include nausea, headache, mental and physical fatigue, and bad breath.
Now, The Whole30 offers a stand-alone, step-by-step plan to break unhealthy habits, reduce cravings, improve digestion, and strengthen your immune system. The Whole30 prepares participants for the program in five easy steps, previews a typical thirty days, teaches the basic meal preparation and cooking skills needed to succeed, and provides a month’s worth of recipes designed to build confidence in the kitchen and inspire the taste buds. Motivating and inspiring with just the right amount of signature tough love, The Whole30 features real-life success stories, an extensive quick-reference FAQ, detailed elimination and reintroduction guidelines, and more than 100 recipes using familiar ingredients, from simple one-pot meals to complete dinner party menus.
You likely will lose weight on Whole30—“many people do appear to lose weight while following the plan, likely due to the decreased reliance on processed foods and increased consumption of whole foods, such as fruits and vegetables,” says Cohen. But it wasn’t designed for weight loss, and once the 30 days are over, you may gain all the weight back as you reintroduce your body to a normal diet.
Low-carb diets may improve high-density lipoprotein (HDL) cholesterol and triglyceride values slightly more than do moderate-carb diets. That may be due not only to how many carbs you eat but also to the quality of your other food choices. Lean protein (fish, poultry, legumes), healthy fats (monounsaturated and polyunsaturated) and unprocessed carbs — such as whole grains, legumes, vegetables, fruits and low-fat dairy products — are generally healthier choices.
The Paleo diet, also referred to as the caveman or Stone-Age diet, includes lean meats, fish, fruits, vegetables, nuts, and seeds. Proponents of the diet emphasize choosing low-glycemic fruits and vegetables. There is debate about several aspects of the Paleo diet: what foods actually existed at the time, the variation in diets depending on region (e.g., tropical vs. Arctic), how modern-day fruits and vegetables bear little resemblance to prehistoric wild versions, and disagreement among Paleo diet enthusiasts on what is included/excluded from the diet. Because of these differences, there is not one “true” Paleo diet.
A number of randomized clinical trials have compared the paleo diet to other eating plans, such as the Mediterranean Diet or the Diabetes Diet. Overall, these trials suggest that a paleo diet may provide some benefits when compared with diets of fruits, vegetables, lean meats, whole grains, legumes and low-fat dairy products. These benefits may include: