The human body works best with a diet that includes some carbohydrate. Recently a Recommended Dietary Allowance for carbohydrate was set at a minimum of 130 grams per day. This would represent 26% of the calories in a 2,000-calorie-per-day diet, which would still be considered a low-carbohydrate diet, but would avoid the potential hazards of more restrictive diets, including symptoms of ketosis (nausea, weakness, dehydration, light-headedness, and irritability) and loss of body protein.

Certain dietary fats and their food sources are associated with good health and reduction of disease risks. Foods high in unsaturated fats that are free of trans fatty acids have been associated with protection from atherosclerosis, heart disease, insulin resistance, and other health concerns. Examples of these foods include olive oil, fatty fish, linseeds, and nuts. However, replacing high-carbohydrate foods with these foods may increase calorie intake if portion sizes are not kept moderate.

Certain sources of dietary protein are more healthy than others. Protein foods containing significant amounts of saturated fat and cholesterol have been associated with many diseases, including heart attacks, type 2 diabetes, insulin resistance, and gallstones; choosing low-fat and low-saturated-fat protein foods can minimise these risks. High meat intake, even of leaner cuts, may increase risk of osteoporosis and kidney stones. Well-done meat or meat that has been preserved with nitrites should be avoided, or kept to a minimum, due to links with cancer. The most healthy choices for increasing protein intake are fish and seafood, low- or nonfat dairy products, pulses (including soyfoods), nuts, and seeds.

Even a low-carbohydrate diet should emphasise healthy carbohydrate sources. Whole grains, fruits, and vegetables supply fibre and many important micronutrients. People with diabetes or insulin resistance may find that choosing carbohydrate foods with a low-glycaemic index improves their blood sugar, blood cholesterol, and triglycerides; helps them better control their weight; and improves symptoms associated with their health conditions.

Bread, cereal, rice, and pasta:

• Whole wheat and whole grain breads
• Breads containing whole, intact grains and seeds (millet, linseed, etc)
• Whole wheat pasta and noodles
• Brown rice, basmati rice
• Barley, buckwheat
• Whole grain cereals, muesli
• Whole wheat pita, chapatis
• Porridge

Dairy products and dairy substitutes:

• Nonfat milk and milk products
• Unsweetened nonfat yoghurt
• Soy drinks

Fats and oils:

• Non-hydrogenated olive oil, rape seed oil, peanut oil
• Non-hydrogenated corn oil, linseed oil, hemp oil, pumpkin seed oil, safflower oil, sesame oil, soyabean oil, sunflower oil

Protein (meat, poultry, fish, eggs, nuts, and beans):

• Lean chicken and turkey
• Egg whites
• Seafood and fish
• Dried beans and peas
• Soya foods
• Nuts and seeds