20 Foods High in Vitamin B1 (Thiamine) for Energy, Nerve Health, and Brain Function

Thiamine, or vitamin B1, was the first B vitamin ever identified and one of the first vitamins discovered in the history of nutritional science, precisely because its deficiency produces such rapid and dramatic consequences. As the coenzyme thiamine pyrophosphate (TPP), it is essential for the conversion of carbohydrates into usable energy in every cell, specifically at the pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase steps of glucose metabolism that link glycolysis to the citric acid cycle. Without thiamine, glucose cannot be fully metabolized for energy, and toxic intermediates accumulate in brain and nerve tissue where energy demand is highest. The National Institutes of Health identifies thiamine as essential for carbohydrate metabolism, nerve impulse conduction, muscle contraction, and DNA and RNA synthesis, with deficiency causing beriberi (affecting the cardiovascular and nervous systems) and Wernicke-Korsakoff syndrome, a severe neurological condition most commonly seen in people with chronic alcohol use disorder.

The recommended dietary allowance for thiamine is 1.2 mg per day for adult men and 1.1 mg for adult women, rising to 1.4 mg during pregnancy and breastfeeding. Thiamine is water-soluble and not stored in significant amounts, requiring consistent daily dietary intake. Harvard T.H. Chan School of Public Health notes that whole grains, legumes, pork, and nuts are the primary thiamine sources, and that food processing and cooking in water significantly reduce thiamine content since it is both heat-sensitive and water-soluble.

Thiamine (Vitamin B1) RDA by Age and Life Stage

Thiamine rarely works alone in energy metabolism — vitamin B2 (riboflavin) is needed for the same carbohydrate-to-energy pathways and is worth tracking alongside it.

The 20 foods below are the richest dietary thiamine sources across animal and plant categories.

Jump to: Pork | Fortified Cereal | Edamame | Black Beans | Lentils | Sunflower Seeds | Asparagus | Macadamia Nuts | Brown Rice | Oats | Green Peas | Acorn Squash | Navy Beans | Whole Wheat Bread | Pecans | Enriched Pasta | Peanuts | Mussels | Trout | Nutritional Yeast | FAQ

20 Foods With the Highest Thiamine Content

1. Pork (Lean): The Richest Everyday Thiamine Meat

A 3-ounce serving of cooked lean pork provides approximately 0.8 mg of thiamine, more than half the daily requirement in a single serving, the highest thiamine content of any commonly consumed meat by a wide margin. Pork has been the traditional thiamine food across multiple cultures, with its exceptional thiamine concentration reflecting the pig’s efficient dietary thiamine accumulation in muscle tissue.

The NIH Office of Dietary Supplements identifies pork as the single richest everyday meat source of thiamine, noting that a 3-ounce serving provides more thiamine than equivalent servings of beef, chicken, or fish combined.

Best eaten: Roasted or grilled as tenderloin or loin chops; marinate in citrus and herbs for flavor; choose lean cuts to maximize thiamine while managing saturated fat.

Per 3 oz cooked pork tenderloin.

2. Fortified Breakfast Cereal: The Most Convenient Thiamine Source

One serving of enriched breakfast cereal provides 0.5 to 1.5 mg of thiamine, often 100 percent or more of the daily requirement. The enrichment of refined grain products with thiamine was introduced as a public health measure after widespread beriberi demonstrated the critical importance of the thiamine removed during milling of white flour and rice.

Best eaten: With low-fat milk or fortified soy milk; choose cereals with whole grain first and minimal added sugar; check the label specifically for thiamine percentage. Many fortified cereals are also a meaningful source of vitamin B6, so it is worth checking the full nutrition panel rather than thiamine alone.

Per 1 serving; values vary by brand. Always check the label.

3. Edamame: A Plant Protein With Excellent Thiamine

One cup of cooked edamame provides approximately 0.5 mg of thiamine alongside complete plant protein, folate, magnesium, and iron. Edamame is one of the better thiamine plant foods and the richest thiamine source among commonly eaten legumes in fresh form.

Best eaten: Steamed and lightly salted as a snack, tossed into grain bowls and stir-fries, or added to salads and noodle dishes.

Per 1 cup cooked, shelled.

4. Black Beans: A Legume With Strong Thiamine Content

One cup of cooked black beans provides approximately 0.4 mg of thiamine alongside protein, fiber, folate, and iron. Legumes are among the most consistent plant-based thiamine sources, and black beans are one of the more thiamine-rich of the common dried bean varieties.

Best eaten: In rice and bean bowls, soups, and burritos; canned black beans are convenient and retain most thiamine; rinse before use.

Per 1 cup cooked.

5. Lentils: A Quick-Cooking Thiamine Legume

One cup of cooked lentils provides approximately 0.3 mg of thiamine alongside 18 grams of protein, folate, and iron. While lentils are not the highest-thiamine legume, their quick cooking time and versatility make them the most practical everyday legume for consistent thiamine contribution from plant sources.

Best eaten: In soups, dals, and curries; red lentils dissolve into creamy pureed soups while green lentils hold their shape for salads.

Per 1 cup cooked.

6. Sunflower Seeds: A Thiamine-Rich Seed Snack

One ounce of dry-roasted sunflower seeds provides approximately 0.4 mg of thiamine alongside vitamin E, magnesium, and selenium. Sunflower seeds are one of the most consistent thiamine contributors across the seed category and a practical everyday snack that delivers thiamine without requiring meal preparation.

Best eaten: As a snack, sprinkled on salads and grain bowls, or stirred into oatmeal.

Per 1 oz dry-roasted, unsalted.

7. Asparagus (Cooked): A Vegetable With Solid Thiamine

One cup of cooked asparagus provides approximately 0.3 mg of thiamine alongside folate, vitamin K, and prebiotic fiber. Asparagus is one of the more thiamine-rich vegetables and one of the best spring vegetables for comprehensive micronutrient coverage across multiple B vitamins simultaneously.

Best eaten: Roasted with olive oil and lemon, steamed briefly, or grilled alongside fish or chicken.

Per 1 cup cooked.

8. Macadamia Nuts: A High-Fat Nut With Strong Thiamine

One ounce of dry-roasted macadamia nuts provides approximately 0.3 mg of thiamine, the highest thiamine content of any common tree nut, alongside monounsaturated fats, manganese, and copper. Macadamia nuts are primarily known for their high fat content but deliver a meaningful thiamine contribution in their characteristically rich, buttery serving.

Best eaten: As a snack in small portions, chopped over salads and grain bowls, or incorporated into baked goods; their high fat content makes one ounce a reasonable daily serving.

Per 1 oz (28 g) dry-roasted.

9. Brown Rice: A Whole Grain Thiamine Staple

One cup of cooked brown rice provides approximately 0.2 mg of thiamine, significantly more than white rice which loses most of its thiamine during milling. The historical significance of thiamine in rice-eating populations, where polished white rice consumption caused epidemic beriberi, makes the choice of brown over white rice particularly meaningful for thiamine specifically.

Best eaten: As a base for grain bowls, stir-fries, and side dishes; cooking in low-sodium broth adds flavor; the thiamine advantage over white rice alone justifies the whole grain choice.

Per 1 cup cooked.

10. Oats: A Breakfast Thiamine Grain

One cup of cooked rolled oats provides approximately 0.2 mg of thiamine alongside beta-glucan fiber, magnesium, and B vitamins. Oats provide thiamine in a practical everyday breakfast format, and their regular daily consumption makes them a consistent background thiamine contributor for millions of people.

Best eaten: As overnight oats or stovetop porridge topped with berries and seeds; steel-cut oats provide a slightly lower glycemic response than rolled oats.

Per 1 cup cooked rolled oats.

11. Green Peas (Cooked): A Vegetable With Meaningful Thiamine

One cup of cooked green peas provides approximately 0.4 mg of thiamine alongside protein, fiber, folate, and vitamin C. Green peas are one of the most thiamine-rich common vegetables and a practical everyday addition to soups, stir-fries, and grain dishes that adds thiamine alongside their broad nutritional profile.

Best eaten: Stirred into soups and stir-fries, tossed into grain bowls, or eaten as a side dish; frozen peas retain most thiamine and are more convenient than fresh.

Per 1 cup cooked.

12. Acorn Squash (Baked): A Winter Vegetable With Thiamine

One cup of baked acorn squash provides approximately 0.3 mg of thiamine alongside potassium, magnesium, and vitamin C. Winter squash varieties including acorn and butternut are among the better vegetable thiamine sources, delivering their B1 alongside the carotenoid antioxidants and potassium that make them nutritionally productive year-round vegetables.

Best eaten: Baked whole and scooped, or halved and roasted with olive oil; its natural sweetness pairs well with warming spices and works as a grain bowl base.

Per 1 cup baked cubed.

13. Navy Beans: A High-Thiamine Legume

One cup of cooked navy beans provides approximately 0.4 mg of thiamine alongside protein, fiber, folate, and iron. Navy beans are among the most thiamine-rich dried legumes and are widely used in baked beans, soups, and stews, making them a practical everyday thiamine contributor for households that eat them regularly.

Best eaten: In baked beans, minestrone, and white bean soups; canned navy beans are convenient and retain most thiamine; rinse before use.

Per 1 cup cooked.

14. Whole Wheat Bread: An Everyday Enriched Grain Thiamine Source

Two slices of whole wheat bread provide approximately 0.3 mg of thiamine from both naturally occurring B1 in the whole grain and mandatory enrichment that restores some of the thiamine lost during processing. Bread is one of the most widely consumed foods globally, making it a primary thiamine contributor at the population level through sheer frequency of consumption.

Best eaten: As everyday sandwich bread and toast; choose 100% whole wheat with minimal added sugar and iodized salt for the broadest nutritional benefit.

Per 2 slices.

15. Pecans: A Tree Nut With Moderate Thiamine

One ounce of pecans provides approximately 0.2 mg of thiamine alongside ellagic acid, gamma-tocopherol, and manganese. Pecans deliver a modest thiamine contribution that adds to total intake when they are consumed regularly as part of a varied nut rotation.

Best eaten: As a snack, chopped over oatmeal and salads, or incorporated into grain bowls.

Per 1 oz (28 g).

16. Enriched Pasta: A Fortified Grain Thiamine Source

One cup of cooked enriched pasta provides approximately 0.3 mg of thiamine from mandatory enrichment with B vitamins including thiamine, riboflavin, niacin, and folic acid that were removed during the milling of white flour. For households that eat pasta regularly, enriched pasta contributes a consistent thiamine addition alongside its carbohydrate energy.

Best eaten: With tomato-based sauces and lean proteins; whole wheat enriched pasta provides additional fiber alongside its thiamine content; check labels for enriched versions specifically.

Per 1 cup cooked enriched pasta.

17. Peanuts: A Legume With Practical Thiamine Content

One ounce of dry-roasted peanuts provides approximately 0.2 mg of thiamine alongside niacin, magnesium, and folate. Peanuts and peanut butter are widely consumed daily snacks that contribute a consistent background thiamine addition alongside their niacin content, which is the highest of any whole food outside of meat.

Best eaten: As a daily snack or as natural peanut butter on whole-grain toast or stirred into oatmeal; choose natural peanut butter with minimal added ingredients.

Per 1 oz dry-roasted.

18. Mussels (Cooked): A Shellfish With Useful Thiamine

A 3-ounce serving of cooked mussels provides approximately 0.3 mg of thiamine alongside vitamin B12, iron, selenium, and omega-3 fatty acids. Shellfish in general are reliable B vitamin sources, and mussels deliver thiamine alongside the most diverse micronutrient profile of any shellfish category.

Best eaten: Steamed in white wine, garlic, and herbs; served with crusty whole-grain bread; a practical special occasion food that delivers thiamine alongside exceptional B12 and iron.

Per 3 oz cooked.

19. Trout (Rainbow, Cooked): A Freshwater Fish With Thiamine

A 3-ounce serving of cooked rainbow trout provides approximately 0.2 mg of thiamine alongside omega-3 fatty acids, vitamin D, B12, and selenium. Fish in general provide modest but consistent thiamine contributions, with trout being a reliable freshwater option with a favorable mercury profile for frequent consumption.

Best eaten: Pan-seared with garlic and lemon, baked whole, or grilled as fillets.

Per 3 oz cooked.

20. Nutritional Yeast (Fortified): A Vegan Thiamine Powerhouse

Two tablespoons of fortified nutritional yeast provide approximately 1.4 mg of thiamine, exceeding the full daily requirement for adult women in a condiment-sized serving. Fortified nutritional yeast is simultaneously one of the best vegan vitamin B12 sources, a strong thiamine source, and a solid source of niacin (vitamin B3), making it one of the most nutritionally dense condiments any plant-based eater can add to their daily diet.

Best eaten: Sprinkled on popcorn, pasta, and grain bowls; stirred into soups and sauces for a cheesy umami depth; check labels for fortification as not all nutritional yeast contains added vitamins.

Per 2 tbsp fortified; values vary by brand. Check label.

Summary: Top 20 Thiamine Foods at a Glance

Tips for Getting the Most Thiamine From Food

Eat pork regularly for the most thiamine-efficient meal protein. No commonly eaten meat comes close to pork’s thiamine density. A 3-ounce serving provides more thiamine than equivalent servings of chicken, beef, or fish. Including pork tenderloin or loin chops once or twice a week is the most impactful single dietary change for thiamine intake from animal foods. For a broader look at energy-supporting foods beyond thiamine alone, see foods that boost energy without caffeine.

Choose enriched and whole grains over refined. Refined white rice and unenriched white flour lose most of their thiamine during milling. Brown rice, whole wheat bread, fortified cereals, and enriched pasta all provide significantly more thiamine than their refined counterparts. For populations where rice is a dietary staple, switching to brown rice is particularly important for thiamine adequacy.

Avoid excessive alcohol consumption. Alcohol impairs thiamine absorption in the intestine, increases thiamine excretion through the kidneys, and reduces the liver’s ability to store thiamine. Chronic heavy alcohol use is the most common cause of severe thiamine deficiency (Wernicke-Korsakoff syndrome) in developed countries, independent of diet quality.

Use gentle cooking methods. Thiamine is both heat-sensitive and water-soluble: boiling meat and vegetables leaches thiamine into the cooking water, and extended high-heat cooking degrades it further. Roasting, steaming, and quick sauteing preserve significantly more thiamine than prolonged boiling.

Raw fish and shellfish should be avoided by people at risk of thiamine deficiency. Certain raw fish and shellfish contain thiaminase, an enzyme that destroys thiamine. This is not a concern for most people who eat a varied cooked diet, but people with marginal thiamine status should avoid consuming large amounts of raw fish regularly.

Frequently Asked Questions

Is “thiamin” the same as “thiamine”?
Yes. Thiamin and thiamine are two accepted spellings of the identical B1 vitamin — thiamin is the official U.S. nutrition-labeling spelling, while thiamine (with an “e”) is more common in scientific and international writing. Both refer to the same nutrient and the same foods listed above.

What are the early symptoms of thiamine (vitamin B1) deficiency?
Early signs include fatigue, irritability, poor appetite, and mild nerve tingling in the hands or feet. Left untreated, severe deficiency can progress to beriberi (affecting the heart and nervous system) or Wernicke-Korsakoff syndrome, a serious neurological condition most often linked to chronic alcohol use.

Can you get too much thiamine from food?
No confirmed toxicity from food-based thiamine has been established, since it is water-soluble and excess amounts are excreted in urine rather than stored. This is different from high-dose supplements, which should still be discussed with a healthcare provider, especially alongside other B vitamins.

Does cooking destroy thiamine?
Yes, to some degree. Thiamine is both heat-sensitive and water-soluble, so boiling foods in large amounts of water causes the greatest losses. Steaming, roasting, and quick sauteing preserve significantly more thiamine than prolonged boiling.

What other B vitamins should I be getting alongside thiamine?
Thiamine works as part of a B-vitamin complex rather than in isolation. Biotin (vitamin B7) and vitamin B2 both support the same energy-metabolism pathways, so eating a varied diet that covers multiple B vitamins is more effective than focusing on thiamine alone.

The Bottom Line

Thiamine is a B vitamin whose dietary sources are heavily concentrated in pork, fortified grains, legumes, and seeds, making it one of the easier B vitamins to meet through a varied diet that includes any of these food categories consistently. The most important thiamine habits are eating pork regularly if you consume meat, choosing enriched and whole grains over refined white products, including legumes several times per week, and limiting alcohol. For vegans and vegetarians, fortified nutritional yeast and fortified cereals are the most reliable high-thiamine sources alongside edamame, lentils, and sunflower seeds.

Nutrition data sourced from the USDA FoodData Central database. Individual values may vary based on food preparation, cooking method, and growing conditions. This article is for informational purposes only and does not constitute medical advice.

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