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Low-Carb Diet Trends
The popularity of low-carb diets has waxed and waned over the past 40 years. The Atkins Diet, the Zone and Protein Power had their time in the spotlight, but the Paleo (Paleolithic) Diet is the latest trend. The Paleo Diet is based on the book by Dr. Loren Cordain, which asserts that the diet our ancestors may have followed more than two million years ago must also be the best diet for us today. The diet consists of foods that can either be hunted (meats and seafood) or gathered (eggs, vegetables, fruit, roots and nuts), and excludes grains, legumes, dairy, salt, refined sugar, alcohol and processed oils.
I applaud the Paleo Diet for urging a higher consumption of vegetables, fruit, roots and nuts, and a lower consumption of dairy, sugar, salt, processed oil and alcohol, but I do not agree that carbohydrates like whole grains and legumes should be excluded from the diet. Nor do I agree that there are health benefits to be reaped from consuming large amounts of meats, seafood and eggs.
What’s Wrong with Low-Carb Diets?
A fundamental problem with low-carb diets is that they glorify protein and demonize carbohydrates. The truth is, human protein requirements are relatively low: just 46 grams a day for the average adult female and 56 grams for the average adult male. This requirement can easily be met without consuming meats, seafood and eggs. Protein can be obtained from plants (e.g. whole grains, legumes, nuts and vegetables), but low-carb diets typically recommend a high intake of animal protein. Unfortunately, eating excess animal protein can also mean eating excess saturated fat, which can increase the risk of developing heart disease and some types of cancer. Plant-based diets, on the other hand, not only provide adequate protein, but also ensure protective benefits against heart disease, stroke, type II diabetes and some cancers.
The Necessity of Carbohydrates
Carbohydrates are necessary for long-term health and are the body’s most important source of energy. But they aren’t created equally. Simple carbs (e.g. fruit and added sugars) and complex carbs (e.g. whole grains, legumes and starchy vegetables) are very different. Rather than recommend a lower consumption of added sugars and processed grains (e.g. soda, cookies and white bread), low-carb diets war against all carbohydrates. Overall, carbs should make up a large portion of the diet, with a focus on vegetables, fruit, whole grains and legumes.
By dramatically reducing the intake of carbohydrates, low-carb diets are also often low in fiber. Fiber, which is abundant in plant foods like whole grains and legumes, is not only essential to a healthy diet but is naturally filling and supports weight-loss. It plays a part in reducing blood cholesterol levels and risk of heart disease, type II diabetes and diverticulosis.
Super Carbs: Whole Grains and Legumes
Low-carb diets like the Paleo Diet exclude whole grains and legumes. Many sources, including the Harvard School of Public Health, cite whole grains as providing important vitamins, minerals, fiber and phytochemicals, helping lower cholesterol, triglyceride and insulin levels, and reducing one’s risk of developing cardiovascular disease and type II diabetes. Legumes (e.g. beans, peas, lentils, soy and peanuts) should also be a staple of most diets. Legumes are a nutritional powerhouse packed with fiber, protein, and essential vitamins and minerals. The Linus Pauling Institute at Oregon State University details the health benefits of legumes, including their role in reducing the risk of developing cardiovascular disease and type II diabetes.
Low-Carb Diets Might Not Be the Best Option
Low-carb diets have been linked to health problems such as nutritional deficiencies, heart disease, high cholesterol, stroke, kidney damage and some cancers. The American Heart Association advises against many low-carb diets for this reason. A 2007 study published in the European Journal of Clinical Nutrition found that individuals that followed a long-term low-carb, diet high in animal protein had an increased rate of cardiovascular and cancer mortality.
What’s so Great about Plant-Based Diets?
The health benefits of plant-based diets are well documented. A position paper by the American Dietetic Association states that, “appropriately planned vegetarian diets, including total vegetarian or vegan diets, are healthful, nutritionally adequate, and may provide health benefits in the prevention and treatment of certain diseases.” A 2009 review of vegetarian diets in the American Journal of Clinical Nutrition cited vegetarians as experiencing lower rates of heart disease, high blood pressure, high cholesterol, diabetes and cancer, a lower body weight and a longer life expectancy than non-vegetarians.
Focus on Plants - Eat Less of the Other Stuff
Based on the nutritional evidence available today, I stand by a plant-based diet. With the top three American killers – heart attack, cancer and stoke – claiming more than 50 percent of all deaths per year, it’s clear that the path to optimal health for most individuals does not include a higher consumption of meats, seafood and eggs, and a lower consumption of whole grains and legumes. Rather, it includes a balanced diet with liberal quantities of vegetables, fruit and legumes; hearty quantities of whole grains, nuts and seeds; sparing amounts of dairy and eggs; and very sparing (if any) seafood, poultry and meats.
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