Sometimes the most heart-supportive nutrients come in small packages.
Reviewed by Dietitian Jane Leverich, M.S., RDN
Key Points
- Dietitians agree that walnuts are the best food to eat before bed to support heart health.
- Walnuts are rich in omega-3s and polyphenols, plus they’re versatile.
- Limiting sodium, engaging in physical activity and eating a balanced diet may also support heart health.
If you’re looking for a simple bedtime snack that can support your heart, look no further than walnuts. They’re packed with heart-healthy nutrients, and research suggests that regularly eating walnuts may help support healthy cholesterol levels and overall heart health.
What makes walnuts especially fitting before bed is that they may also support sleep, and getting enough quality sleep is essential for heart health. Walnuts are also widely accessible and highly versatile. Toss them into salads, grain bowls, pastas or desserts, or use crushed walnuts as a crunchy coating for fish, chicken or other proteins. Ahead, dietitians explain why walnuts are the best food to eat before bed for better heart health, plus other habits to help keep your heart strong and healthy.
Why We Love Walnuts Before Bed for Better Heart Health
They’re Rich in Omega-3s
“Walnuts are the only tree nut that’s an excellent source of alpha-linolenic acid, or ALA, the plant-based omega-3,” says Jordan Langhough, RD, CPT. Your body cannot make ALA, so you must get it from food sources, such as walnuts. ALA may support heart health by lowering triglyceride and blood pressure levels, reducing inflammatory markers and minimizing cell damage.
Eating about one serving of walnuts each day provides the amount of ALA associated with a reduced risk of death from heart disease.
They May Support Cholesterol Levels
Research suggests that regularly eating walnuts may modestly lower LDL (“bad”) cholesterol and total cholesterol. “Walnuts appear to reduce the number of small, dense LDL particles specifically, which are considered more likely to contribute to artery-clogging plaque than larger LDL particles,” shares Langhough.
Walnuts’ impressive nutritional profile may explain their cholesterol benefits. Replacing saturated fats with polyunsaturated fats enhances LDL cholesterol removal from the bloodstream, helping lower LDL cholesterol levels. Dietary fiber and plant sterols in walnuts influence cholesterol absorption in the gut, encouraging the removal of cholesterol and bile acids to lower circulating levels. Furthermore, emerging research suggests that walnuts may influence gut microbiota, promoting short-chain fatty acid production, which may help affect lipid metabolism and cholesterol levels.
They May Help Support Sleep
Another reason walnuts are the best food to eat before bed for better heart health is because they also support sleep, which can benefit heart health. Sleep plays an important role in heart health, and poor sleep is associated with greater inflammation, higher blood pressure and increased cardiovascular risk over time, explains Langhough. Walnuts may support better sleep because they’re one of the few foods that naturally contain melatonin. “A 2025 study found that daily walnut consumption boosted melatonin levels and improved sleep quality, resulting in quicker sleep onset and better efficiency,” explains Whitney Stuart, M.S., RD, CDCES.
Walnuts also provide tryptophan and magnesium, two nutrients that may further support restful sleep. Tryptophan is an amino acid that can cross the blood-brain barrier, where it then gets converted to melatonin. Magnesium may also play a role, with research linking higher magnesium levels to better sleep quality.
They Contain Polyphenols That Support Heart Health
Walnut polyphenols support endothelial function and reduce oxidative stress, which can damage LDL cholesterol and turn it into oxidized LDL. This more harmful form contributes to inflammation and plaque buildup in the arteries. Walnuts also provide L-arginine, an amino acid that plays an important role in producing nitric oxide, notes Brannon Blount, M.S., RDN, LDN. Nitric oxide helps blood vessels relax and supports healthy blood flow, Blount adds. Plus, walnuts contain alpha-tocopherol, a form of vitamin E with antioxidant properties that may further help protect against LDL cholesterol from oxidation, says Blount.
Other Strategies to Support Heart Health
- Eat more seafood. “Seafood choices like salmon, mackerel, sardines and anchovies are highest in omega-3s, which can help to lower triglycerides and have a modest effect on blood pressure,” says Patricia Kolesa, MS, RDN. Jacqueline Gomes, RDN, M.B.A., adds that omega-3s, vitamin D and vitamin B6 in fatty fish like salmon support sleep. “These nutrients help regulate inflammation and play a critical role in melatonin synthesis, which can improve sleep quality and a more balanced sleep-wake cycle,” she says.
- Boost your intake of plant proteins. “Plant-based proteins are low in saturated fat, and a lower saturated fat intake has been supportive of lower dietary cholesterol,” shares Kolesa. Other plant-based proteins include tempeh, chickpeas, tofu, beans and lentils.
- Stay active. Exercise helps lower triglycerides and LDL cholesterol, while increasing high-density lipoprotein (HDL or “good”) cholesterol. It also reduces inflammation over time and contributes to blood pressure management. Aim for 150 minutes of moderate-intensity aerobic exercise and two strength-training sessions weekly.
- Limit sodium intake. The American Heart Association recommends keeping sodium intake to less than 2,300 milligrams per day, with an ideal limit of less than 1,500 mg. Too much salt in the diet can increase blood pressure, which raises the risk of heart disease.
Our Expert Take
Walnuts are a simple addition to your daily routine to help support heart health, especially when included as part of an overall heart-healthy lifestyle. Walnuts’ omega-3 fats, fiber, polyphenols and other beneficial nutrients may support healthy cholesterol levels, blood vessel function and sleep, all factors that matter for heart health. Enjoy a handful before bed or add walnuts to meals and snacks throughout the day.