Walnuts are a popular nut commonly grown across much of the United States. Although available year-round in most grocery stores because they can be easily stored unshelled, walnuts are harvested in the late summer and early fall months.

Rich, strong, gleaming hair requires proper hair care -- washing and cutting on a regular basis -- as well as a healthy diet. While hair loss and duller-looking hair that becomes thin and breaks easily can be the result of many factors, a diet low in protein, such as during a crash diet, can lead to poor hair health.

Both expeller-pressed and cold-pressed coconut oil are good options for your health, but the one that's best for you depends on what you're using it for.

Good oral hygiene is important to prevent cavities and gum disease that can lead to tooth loss. The American Dental Association recommends brushing your teeth twice a day with fluoride toothbrush and cleaning between your teeth daily to remove bacteria and food particles that a toothbrush can’t reach.

Psyllium is a soluble fiber produced from the Plantago ovata shrub. When exposed to fluids, the husk — from the outer portion of the seeds of the plant — swells up to create a gel. The powder has a finer texture than the husk, and is more commonly used in capsules.

Sorbic acid is a natural compound that is also made synthetically. First isolated from berries in the 1800s, it became commercially available for use as a food preservative in the 1940s and 1950s.. Due to its antimicrobial properties, it's added to a variety of foods to preserve freshness.

Nothing rivals the snap of a bar of chocolate and the rich, milky taste on your tongue. Unfortunately, some medical conditions may make it difficult to enjoy the sweet treat. Eating too much of anything -- including chocolate -- will give you a stomachache, so exercise moderation in your indulgence.

Serotonin is a brain neurotransmitter well known for its role in mood regulation, and it's also responsible for breathing and regulation of body temperature.

Roasting pumpkin seeds is a Halloween tradition in many American households, but you're doing yourself a disservice if you only eat these seeds once a year. Rich in essential fatty acids and the amino acid tryptophan, pumpkin seeds pack a powerful nutritional punch.

Ketosis diets, which are low-carbohydrate diets that cause your body to rely on fat for fuel, may be used to help treat epilepsy and could have the potential to reduce the symptoms of certain neurodegenerative diseases, such as Parkinson's disease, according to an article published in "Pediatrics" in March 2007.

The Candida diet aims to control Candida albicans, a yeast in the human body that can cause infections when grown in excess.

Acacia powder is made by grinding up acacia gum, which is naturally produced by the acacia tree, an evergreen belonging to the legume family that is native to Africa. Consumed as a dietary supplement for its high soluble-fiber content, acacia powder can be taken in capsule or tablet form, or as a loose powder.