Key Takeaways
- Pistachios supply several nutrients linked to sleep health, including melatonin, tryptophan, and vitamin B6.
- Research suggests American-grown pistachios have notable melatonin levels compared to many other plant-based foods.
- Experts emphasize that while pistachios offer a helpful mix of vitamins, minerals, and antioxidants, evidence showing they directly improve sleep remains preliminary.
What the Source Says
A 2026 review in Nutrition Research Reviews examined how the nutrient structure of pistachios relates to sleep pathways. Registered dietitian Erin Palinsky-Wade told TODAY.com that American-grown pistachios contain approximately 660 nanograms of melatonin per gram. They also contain tryptophan, an essential amino acid that research suggests helps relax the body.
Pistachios are also a source of vitamin B6, which supports the body in producing sleep-regulating compounds like serotonin and GABA. Ohio State Health & Discovery indicates that one ounce provides about 25 percent of the recommended daily value of vitamin B6, whereas the 2026 review reported that a serving provides around 40 percent. Additionally, research by Dr. Jack Losso and Millicent Yeboah-Awudzi at Louisiana State University, collaborating with American Pistachio Growers, found that melatonin levels in American pistachios surpass those in most other fruits, seeds, and grains.
Dr. Marie-Pierre St-Onge of Columbia University Irving Medical Center explained that pistachios are valuable to study because they combine multiple sleep-related nutrients in a single whole food. However, review authors noted that vitamin B6 may primarily benefit individuals who are deficient, and further studies are needed to confirm direct effects on sleep quality.
Practical Notes
Preventive cardiology dietitian Michelle Routhenstein told Healthline that a standard portion size is a small handful, or about one ounce of shelled pistachios, which can be eaten during the day or as a light snack. Dietitian Sylvia Melendez-Klinger told AARP that other options, such as almonds and walnuts, also contain sleep-related nutrients like zinc and magnesium.
Because restless nights can stem from many different physical or environmental causes, dietary changes alone may not resolve sleep difficulties. If you are experiencing ongoing sleep issues, you should talk to your doctor.
Source: senior health nutrition wellness study - BingNews · Published October 29, 2026 · Photo by Brenan Greene on Unsplash
This article is for general information only and is not medical advice. Talk to your doctor before making health decisions.
