An erection depends partly on healthy blood vessels and sufficient blood flow. When circulation is affected by conditions such as high blood pressure, diabetes or atherosclerosis, achieving or maintaining an erection may become more difficult.
The good news is that a balanced, heart-healthy diet may support vascular health and help reduce some of the risk factors associated with erectile dysfunction.
In Japan, traditional foods such as oily fish, tofu, natto, green vegetables and seaweed offer practical ways to support cardiovascular health through everyday meals.
However, no single food can cure erectile dysfunction, and dietary changes should not replace medical treatment when it is needed.
This Healing Medex guide explores 10 heart-healthy foods, their nutritional benefits, how they may indirectly support erectile function and simple ways to include them in a Japanese diet.
How Are Heart Health and Erectile Dysfunction Connected?
The heart, blood vessels and erectile system all depend on healthy circulation.
During sexual arousal, nerves trigger the release of nitric oxide, a molecule that helps relax smooth muscle within penile blood vessels. This allows more blood to enter the erectile tissues.
Several cardiovascular conditions can interfere with this process:
High blood pressure: Can damage blood vessels and impair normal circulation.
High cholesterol: May contribute to plaque buildup in the arteries.
Diabetes: Can damage blood vessels and nerves involved in erections.
Obesity: Is associated with metabolic and cardiovascular problems that increase ED risk.
Atherosclerosis: Can narrow arteries and reduce blood supply.
Maintaining healthy blood pressure, blood sugar levels and cholesterol can therefore benefit both cardiovascular and sexual health.
10 Heart-Healthy Foods That May Also Support Erectile Function
1. Salmon (Sake) – A Source of Omega-3 Fatty Acids
Salmon is a popular fish in Japan and an excellent source of protein and omega-3 fatty acids.
Omega-3 fats are important components of a heart-healthy eating pattern and may help improve certain cardiovascular risk factors.
Heart-health benefits:
Provides beneficial unsaturated fats.
Supplies high-quality protein and vitamin D.
How it may support erectile function:
Healthy blood vessels are important for erections. By contributing to cardiovascular health, salmon may indirectly support the circulation necessary for normal erectile function.
However, research has not established that eating salmon alone improves ED symptoms.
How to include it in a Japanese diet:
Enjoy grilled salmon (shiozake), preferably with minimal added salt, alongside brown rice, steamed vegetables and a small serving of tofu.
2. Mackerel (Saba) – Supports Cardiovascular Health
Mackerel is another commonly eaten fish in Japan, available fresh, grilled or canned.
It contains omega-3 fatty acids, vitamin B12 and high-quality protein.
Heart-health benefits:
Supplies EPA and DHA omega-3 fatty acids.
Can replace protein sources higher in saturated fat.
Fits into a heart-healthy dietary pattern.
How it may support erectile function:
Since vascular problems can contribute to ED, choosing omega-3-rich fish instead of heavily processed meats may help protect long-term cardiovascular health.
There is no reliable evidence that mackerel works as an immediate erection enhancer.
How to include it in a Japanese diet:
Try saba shioyaki with less salt, grilled mackerel with grated daikon or canned mackerel in water with vegetables.
3. Natto – A Traditional Japanese Soybean Food
Natto is made from fermented soybeans and is a traditional Japanese breakfast food.
It provides plant protein, fibre and several important nutrients.
Heart-health benefits:
Supplies plant-based protein.
Contains fibre that supports a healthier diet.
Can help replace some foods higher in saturated fat.
How it may support erectile function:
Although natto contains compounds such as isoflavones, there is insufficient clinical evidence that natto directly treats ED or increases testosterone.
How to include it in a Japanese diet:
Serve natto with brown rice, chopped spring onions and vegetables. Use less of the salty sauce packet when possible.
Important: Natto is particularly rich in vitamin K. People taking warfarin should discuss natto consumption with their prescribing clinician because it can interfere with anticoagulation management.
4. Spinach and Komatsuna – Nutrient-Rich Leafy Vegetables
Spinach (horenso) and komatsuna (Japanese mustard spinach) are common leafy greens in Japanese cooking.
They provide folate, potassium, fibre and various plant compounds.
Some leafy vegetables also contain naturally occurring dietary nitrates.
Heart-health benefits:
Contribute nutrients needed for normal cardiovascular function.
Help increase daily vegetable consumption.
How they may support erectile function:
Dietary nitrate can be converted through biological pathways into nitric oxide, which has a role in blood vessel relaxation.
However, consuming nitrate-containing vegetables does not guarantee improved erectile performance.
How to include them in a Japanese diet:
Prepare spinach ohitashi, lightly steamed komatsuna or vegetable stir-fries using modest amounts of oil and reduced-sodium seasoning.
5. Walnuts and Almonds – Sources of Healthy Fats
Nuts provide unsaturated fats, plant protein, fibre and minerals.
Walnuts also contain alpha-linolenic acid (ALA), a plant-based omega-3 fatty acid.
Heart-health benefits:
Provide beneficial unsaturated fats.
May support healthier cholesterol levels when replacing less healthy snacks.
Offer fibre and essential nutrients.
How they may support erectile function:
A healthy cholesterol profile and better vascular health are important for maintaining normal circulation.
Nuts may support erectile health indirectly as part of a balanced diet, but are not a proven standalone ED treatment.
How to include them in a Japanese diet:
Choose a small handful of unsalted almonds or walnuts as a snack, or add chopped nuts to salads and vegetable dishes.
6. Tomatoes – A Source of Lycopene
Tomatoes are widely available in Japan and can easily be added to meals.
They contain vitamin C, potassium and lycopene, a plant pigment with antioxidant properties.
Heart-health benefits:
Supply antioxidants and potassium.
Contribute to greater fruit and vegetable intake.
Can replace less nutritious side dishes.
How they may support erectile function:
Tomatoes contribute to a healthy dietary pattern that may protect vascular health.
Although lycopene has been investigated for cardiovascular benefits, evidence does not establish that tomatoes or lycopene supplements treat ED.
How to include them in a Japanese diet:
Add fresh tomatoes to salads, prepare tomato-based vegetable soups or serve them with grilled fish.
7. Tofu and Edamame – Heart-Friendly Plant Proteins
Soy foods are important ingredients in Japanese cuisine.
Tofu, edamame and unsweetened soy milk provide protein and can be useful alternatives to fatty or processed meats.
Heart-health benefits:
Offer plant-based protein.
Generally contain less saturated fat than fatty meats.
Support a varied diet that includes legumes.
How they may support erectile function:
Improving overall dietary quality can help manage cardiovascular and metabolic risk factors associated with ED.
Normal consumption of soy foods has not been shown to provide a reliable treatment for erectile dysfunction or a meaningful boost in testosterone.
How to include them in a Japanese diet:
Enjoy chilled tofu (hiyayakko), boiled edamame without excess salt, tofu soup or stir-fried tofu with vegetables.
8. Brown Rice (Genmai) – Supports Metabolic Health
White rice is a major staple in Japan, but brown rice provides more fibre and retains more of the grain's natural nutrients.
Whole grains are recommended as part of a heart-healthy eating pattern.
Heart-health benefits:
Provides more dietary fibre than refined white rice.
Supports healthier cholesterol and metabolic profiles.
Can contribute to better long-term blood sugar management.
How it may support erectile function:
Diabetes, obesity and cardiovascular disease are important risk factors for ED.
Choosing whole grains regularly may help support metabolic health and indirectly benefit erectile function.
How to include it in a Japanese diet:
Try genmai rice or a mixture of brown and white rice with grilled fish, vegetables and soybean dishes.
Portion size still matters, particularly for individuals managing diabetes.
9. Seaweed (Wakame and Nori) – A Traditional Japanese Ingredient
Seaweed is commonly found in Japanese soups, salads and rice dishes.
Different varieties provide fibre and minerals, although their nutritional composition varies considerably.
Heart-health benefits:
Adds variety and fibre to meals.
Can be part of a nutritious, vegetable-rich dietary pattern.
Offers a low-calorie ingredient when prepared without excessive salt or sugar.
How it may support erectile function:
Seaweed can contribute to overall dietary quality, which supports cardiovascular health.
However, there is insufficient evidence that eating seaweed directly improves erections.
How to include it in a Japanese diet:
Use small portions of wakame in salads, nori with rice or seaweed in vegetable soups.
Important: Some seaweeds, particularly kombu, contain very high amounts of iodine. Excessive iodine intake can affect thyroid function. People with thyroid disorders should discuss appropriate intake with a healthcare professional.
10. Berries and Citrus Fruits – Sources of Antioxidants
Strawberries, blueberries, mikan (Japanese mandarins) and other fruits supply vitamin C, fibre and a variety of plant compounds.
Berries contain anthocyanins, while citrus fruits provide other flavonoids.
Heart-health benefits:
Support a varied, plant-rich diet.
Can replace desserts or snacks high in added sugar.
How they may support erectile function:
Fruit-rich dietary patterns are associated with better cardiovascular health and may help lower ED risk.
Some observational research has explored relationships between flavonoid intake and erectile function, but this does not prove that individual fruits prevent or reverse ED.
How to include them in a Japanese diet:
Choose fresh strawberries, mikan or blueberries as a snack or dessert. Whole fruit is generally preferable to sweetened fruit juice.
Which Foods Have the Strongest Evidence for Supporting Erectile Health?
Although each food listed above offers nutritional benefits, it is important to distinguish heart-health evidence from direct erectile dysfunction evidence.
Research supports eating patterns rich in vegetables, fruits, legumes, whole grains, fish, nuts and unsaturated fats.
The US National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) notes that healthy eating patterns, including Mediterranean-style diets, may reduce the risk of developing ED and improve symptoms in some people.
However, most studies investigate entire dietary patterns rather than proving that a particular food improves erection quality.
For Japanese adults, a balanced diet incorporating traditional Japanese ingredients can provide many of the same nutritional features.
How to Build a Heart-Healthy Japanese Diet
Japan has a wide variety of nutritious traditional foods, making it possible to follow a heart-healthy diet without relying on expensive supplements or unusual ingredients.
A practical daily meal plan could look like this:
Meal | Heart-healthy Japanese food ideas |
|---|---|
Breakfast | Brown rice, natto, spinach and unsweetened green tea |
Lunch | Grilled salmon, tofu, vegetables and a small serving of rice |
Afternoon snack | Unsalted almonds and fresh mikan |
Dinner | Grilled mackerel, komatsuna, wakame salad and brown rice |
Drinks | Water and unsweetened tea |
These meals provide a combination of fibre, protein, unsaturated fats and vegetables.
The American Heart Association's 2026 dietary guidance also emphasises a variety of vegetables and fruits, whole grains, healthy protein sources, unsaturated fats, and reduced sodium and added sugar.
A Note About Sodium in Japanese Meals
Some Japanese foods and seasonings can contain substantial amounts of sodium, including soy sauce, miso, pickles, instant noodles and salted fish.
Frequent excessive sodium intake may contribute to high blood pressure.
To protect cardiovascular health, consider choosing reduced-sodium soy sauce, using smaller amounts of miso, limiting very salty pickles and avoiding drinking all the broth from high-sodium soups.
The goal is not to eliminate traditional Japanese foods but to prepare balanced meals with appropriate portions and less added salt.
Foods and Eating Habits That May Worsen Cardiovascular Risk
Just as certain foods can support heart health, regularly consuming excessive amounts of some foods can increase cardiovascular and metabolic risk.
1. Highly Processed Meats
Processed sausages, bacon and similar products may be high in sodium and saturated fat. Eating them frequently can make it harder to follow a heart-healthy diet.
2. Deep-Fried Foods
Tempura, karaage and other fried foods can fit occasionally into a balanced diet, but large portions and frequent consumption may increase overall calorie intake.
3. Excessive Salt
High-sodium foods may contribute to elevated blood pressure, which is associated with erectile dysfunction.
4. Sugary Drinks
Sweetened beverages and excessive added sugar can contribute to unwanted weight gain and poor metabolic health.
5. Excessive Alcohol
Heavy alcohol consumption can affect cardiovascular health, hormones and erectile function. Reducing alcohol intake may be beneficial, especially for individuals experiencing ED.
Rather than avoiding entire food groups unnecessarily, focus on moderation, variety and the overall quality of your diet.
Can a Heart-Healthy Diet Reverse Erectile Dysfunction?
A healthier diet may improve erectile function in some men, particularly when ED is associated with obesity, poor cardiovascular health or metabolic conditions.
Dietary improvements may help by:
Supporting blood vessel health and circulation.
Improving cholesterol and blood pressure management.
Helping maintain a healthy body weight.
Supporting blood sugar control.
Reducing certain cardiovascular risk factors.
However, diet alone cannot reliably reverse every case of erectile dysfunction.
ED can also result from nerve damage, hormonal disorders, medication side effects, psychological factors or other underlying medical conditions.
A healthcare professional can help identify the cause and determine whether lifestyle changes, counselling, medication or other treatments are appropriate.
Other Lifestyle Habits That May Support Erectile Function
Eating a balanced diet is only one aspect of cardiovascular and sexual health.
Exercise Regularly
Walking, cycling, swimming and other forms of aerobic exercise can support cardiovascular fitness and healthy circulation.
Maintain a Healthy Weight
Managing excess body weight may improve metabolic health and reduce some risk factors associated with ED.
Get Adequate Sleep
Consistent, sufficient sleep supports overall health, hormone regulation and psychological well-being.
Stop Smoking
Smoking damages blood vessels and is an established risk factor for cardiovascular disease and erectile dysfunction.
Manage Stress
Stress and anxiety can interfere with sexual arousal and may contribute to temporary or persistent erection problems.
Combining these habits with a nutritious diet is generally more beneficial than focusing on a single food or supplement.
When Should You See a Doctor About Erectile Dysfunction in Japan?
Occasional difficulty getting or maintaining an erection can happen for many reasons, including fatigue, stress or alcohol consumption.
However, persistent or recurring ED deserves medical attention.
Consider speaking with a doctor if:
Erectile difficulties occur repeatedly or continue over time.
You have diabetes, high blood pressure or high cholesterol.
You notice a significant change in erectile function.
You experience reduced sexual desire or other possible hormonal symptoms.
ED is affecting your relationships or emotional well-being.
In Japan, people can consult a general physician, internal medicine specialist (naika) or urologist (hinyokika) for an assessment.
A doctor may recommend checking blood pressure, blood glucose, cholesterol and, when clinically appropriate, hormone levels.
Because erectile dysfunction can sometimes be an early sign of cardiovascular disease, ignoring persistent symptoms may delay the diagnosis of an underlying health condition.
Frequently Asked Questions
1. What is the best Japanese food for erectile dysfunction?
There is no single Japanese food proven to treat erectile dysfunction. Oily fish, soy foods, vegetables, whole grains and nuts are nutritious choices that support cardiovascular health and may indirectly benefit erectile function.
2. Can eating salmon improve erections?
Salmon contains omega-3 fatty acids that support a heart-healthy diet. However, evidence does not show that consuming salmon directly produces stronger erections.
3. Is natto good for men's sexual health?
Natto provides plant protein and fibre, making it a useful part of a balanced diet. However, there is insufficient evidence that natto directly improves erectile dysfunction or testosterone levels.
4. Does green tea improve erectile function?
Unsweetened green tea contains polyphenols and can be a suitable alternative to sugary beverages. Although researchers have investigated its possible cardiovascular benefits, there is not enough clinical evidence to recommend green tea as a treatment for ED.
5. Is brown rice better than white rice for erectile health?
Brown rice contains more fibre and generally provides more whole-grain nutrients than white rice. Replacing some refined grains with whole grains can support metabolic and cardiovascular health, but brown rice has not been proven to directly treat ED.
6. Can a Japanese-style diet help prevent erectile dysfunction?
A well-balanced Japanese-style diet rich in fish, soy foods, vegetables, fruits and whole grains may help reduce cardiovascular and metabolic risk factors associated with ED.
However, prevention is not guaranteed, and other factors such as age, smoking, medication use and existing medical conditions also matter.
7. How long does a healthy diet take to improve erectile function?
There is no guaranteed timeline. Changes in blood pressure, cholesterol, weight and metabolic health may develop over weeks or months.
Whether erectile function improves depends on the underlying cause, the severity of ED and other health factors.
8. Can food replace erectile dysfunction medicines?
No. Nutritious foods support general health but should not be considered substitutes for medically indicated treatment.
People experiencing persistent erectile difficulties should seek advice from a qualified healthcare professional rather than relying solely on foods or supplements.
Final Thoughts
Heart health and erectile function share an important connection: both depend in part on healthy blood vessels and circulation.
A Japanese diet that includes salmon, mackerel, natto, leafy vegetables, nuts, tomatoes, tofu, brown rice, seaweed and fresh fruits can provide nutrients that support cardiovascular and metabolic health.
These foods may help reduce some of the risk factors associated with erectile dysfunction, especially when combined with physical activity, adequate sleep, stress management and avoiding smoking.
However, no individual food is a guaranteed treatment for ED. The strongest dietary evidence supports long-term healthy eating patterns rather than specific foods marketed as natural erection boosters.
For men in Japan experiencing ongoing erection difficulties, a balanced diet can be a valuable part of a broader health strategy, but proper medical evaluation remains important.
Medical Disclaimer
This article is for general educational purposes only and does not replace advice from a qualified doctor or pharmacist. Medical guidance, approved medicines and prescribing rules differ between countries. Always follow the advice of a healthcare professional licensed in your country of residence.
