If you’re looking for a nutritious plant-based food that provides plenty of protein without being highly processed, tempeh is worth getting to know.
Tempeh is a traditional Indonesian fermented food most commonly made from soybeans. During production, cooked soybeans are fermented primarily with Rhizopus fungi, which bind the beans together into the firm, compact cake we recognize as tempeh.
Unlike tofu, which is made from soy milk, traditional tempeh retains the whole soybean. That means you’re getting protein, fiber, minerals, unsaturated fats and naturally occurring soy compounds in one food.
Fermentation makes tempeh particularly interesting. It changes some of the soybean’s proteins and phytochemicals, reduces certain antinutritional compounds, and increases the proportion of more readily absorbed forms of some soy isoflavones.
So, what could eating tempeh actually do for your health?
Key Takeaways
- Tempeh is an excellent source of plant protein, typically providing around 18–20 grams of protein per 100 grams, although amounts vary by product.
- Fermentation changes the nutritional properties of soybeans and can reduce phytate and other antinutritional factors.
- Tempeh contains soy isoflavones, including genistein and daidzein, and fermentation increases the proportion present as more readily absorbed aglycones.
- Tempeh can fit into a heart-healthy diet, particularly when it replaces foods higher in saturated fat.
- Fermented soy foods have shown promising effects on certain metabolic markers, although research specifically involving tempeh is much more limited.
- Tempeh shouldn’t automatically be considered a probiotic food, particularly after cooking.
- Tempeh is nutritious, but it isn’t a treatment or cure for any medical condition.
1. Provides Plenty of High-Quality Plant Protein
Protein is probably the first nutritional benefit you’ll notice with tempeh.
Traditional soybean tempeh generally contains around 18–20 grams of protein per 100 grams, with the exact amount depending on the product and preparation method.
Soy is particularly valuable among plant protein sources because it provides all nine essential amino acids. That makes tempeh an excellent protein option for vegetarians and vegans, but you certainly don’t have to follow a plant-based diet to benefit from it.
Adequate dietary protein is important for maintaining and repairing muscle and other tissues. Protein is also involved in producing enzymes, hormones and many other compounds your body needs.
There’s another practical advantage: protein contributes to satiety. A protein-rich meal can help you feel satisfied, which can be useful for appetite and weight management.
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2. Fermentation Changes the Nutritional Properties of Soybeans
This is where tempeh becomes particularly interesting.
During fermentation, microorganisms produce enzymes that break down various components of the soybean. Proteases, for example, partially break proteins into smaller peptides and amino acids.
Fermentation also reduces some compounds commonly described as antinutritional factors, including phytate. Phytate can bind minerals in the digestive tract and reduce their absorption.
The extent of these changes depends on the microorganisms, fermentation conditions, raw ingredients, and preparation methods.
It’s therefore more accurate to say that fermentation can improve certain aspects of digestibility and nutrient availability rather than claiming that every nutrient in tempeh is necessarily absorbed better.
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3. May Support Heart Health
Tempeh can fit comfortably into a heart-healthy eating pattern.
One reason is its protein source. Replacing some foods high in saturated fat with foods such as tempeh can improve the overall nutritional profile of your diet.
Soybeans also contain unsaturated fats, isoflavones, and other bioactive compounds that have been investigated for their potential cardiovascular effects.
Clinical research on fermented soy foods as a group has produced encouraging results. A systematic review and meta-analysis of 15 randomized controlled trials found that fermented soy interventions produced a modest reduction in total cholesterol, although not all metabolic markers improved significantly.
It’s important to keep that finding in perspective.
Fermented soy is a broad category, and studies of fermented soy foods aren’t necessarily studies of tempeh.
For that reason, I wouldn’t think of tempeh as a cholesterol-lowering treatment. A better way to look at it is as a nutritious protein source that can contribute to an overall heart-healthy dietary pattern.
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4. Contains Beneficial Soy Isoflavones
If you’ve read about soy and health, you’ve probably encountered the word isoflavones.
Isoflavones are naturally occurring plant compounds found particularly abundantly in soybeans. Two of the best known are genistein and daidzein.
Fermentation changes the forms in which these compounds occur.
In unfermented soybeans, many isoflavones are present as glycosides. During tempeh fermentation, microbial enzymes called beta-glucosidases can convert some of these compounds into aglycones.
Aglycones are generally absorbed more readily in the intestine.
Researchers continue to investigate soy isoflavones for potential effects involving cardiovascular health, vascular function, bone health, and menopausal symptoms, among other areas.
However, much of the human research concerns soy or soy isoflavones generally rather than tempeh specifically.
So while fermentation clearly changes tempeh’s isoflavone profile, we shouldn’t assume that every proposed benefit of soy isoflavones has been demonstrated specifically by eating tempeh.
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5. Contains Potentially Beneficial Bioactive Compounds
Tempeh isn’t simply a mixture of protein, carbohydrates, and fat.
Fermentation creates or modifies numerous biologically active compounds.
Researchers have identified short peptides in tempeh with antioxidant and angiotensin-converting enzyme (ACE)-inhibitory activity under experimental conditions. Fermentation can also increase or alter compounds such as amino acids, isoflavone aglycones and other metabolites.
These findings are interesting because they provide possible biological mechanisms through which fermented foods such as tempeh might influence health.
But there’s an important distinction to make.
Showing antioxidant or ACE-inhibitory activity in laboratory experiments doesn’t prove that eating tempeh prevents cardiovascular disease or lowers blood pressure in humans.
Much of this research remains preclinical, and more well-designed human studies specifically involving tempeh are needed.
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6. May Support Metabolic Health
Researchers are also investigating fermented soy foods for possible effects on blood glucose, body composition and other metabolic markers.
A meta-analysis of 15 randomized controlled trials found that fermented soy interventions were associated with modest improvements in fasting blood glucose, total cholesterol, BMI, waist circumference and visceral fat compared with controls.
The results are promising, but they require some context.
The studies involved fermented soy products as a category, not exclusively tempeh. The magnitude of some changes was also relatively small.
So it would be premature to say that tempeh itself lowers blood sugar or causes weight loss.
What we can say more confidently is that tempeh provides substantial protein and can easily be incorporated into meals based around vegetables, legumes, whole grains and other minimally processed foods.
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7. Supplies Important Minerals
Tempeh can also contribute several essential minerals to your diet.
Depending on the product, these may include:
- Iron
- Magnesium
- Manganese
- Phosphorus
- Copper
- Calcium
The amount of calcium can vary substantially among products, so it’s worth checking the nutrition label if calcium is particularly important to you.
Fermentation may also affect mineral availability.
Soybeans naturally contain phytate, which can bind minerals. Microbial phytase activity during fermentation can break down some phytate.
Laboratory and animal research supports the possibility that this could improve mineral bioavailability, although the extent of this benefit hasn’t been firmly established in humans eating tempeh.
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8. May Have Gut-Health Benefits — But Tempeh Isn’t Necessarily Probiotic
Because tempeh is fermented, it’s tempting to immediately call it a probiotic food.
That’s not quite accurate.
Microorganisms are essential to producing tempeh, and fermentation creates numerous metabolites and changes the structure of the soybean.
But tempeh is normally cooked before you eat it.
Cooking can substantially reduce or eliminate living microorganisms, meaning cooked tempeh shouldn’t automatically be considered a reliable source of live probiotics.
Its potential digestive or gut-health benefits may instead come from other characteristics of the food, including fiber and compounds produced or transformed during fermentation.
Research into tempeh and the human gut microbiome is developing, but we need more human clinical studies before making strong conclusions.
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9. Can Fit Well Into a Weight-Management Diet
I wouldn’t call tempeh a “weight-loss food,” because no individual food causes meaningful fat loss on its own.
But tempeh does have characteristics that can make it useful when managing your weight.
Its high protein content can help make meals more satisfying. It can also replace foods that contain more saturated fat or are more heavily processed.
Research involving fermented soy products has found small improvements in measurements such as BMI, waist circumference and visceral fat in clinical trials.
But those results don’t prove that tempeh itself causes weight loss.
Your overall calorie intake, dietary pattern, physical activity, sleep and long-term habits remain far more important than whether you eat any particular food.
10. Offers a Nutrient-Dense Alternative to Meat
Perhaps one of tempeh’s biggest advantages is also its simplest: it gives you another nutritious protein option.
You don’t have to become vegetarian.
You can simply use tempeh occasionally in place of meat in stir-fries, rice bowls, salads, wraps, curries, sandwiches and noodle dishes.
Because tempeh has a firm texture and mildly nutty flavor, it works particularly well with marinades and strongly flavored sauces.
And because traditional tempeh is made from whole soybeans held together through fermentation, it remains relatively close to the original legume compared with many highly processed meat substitutes.
Are There Any Downsides to Eating Tempeh?
For most people, tempeh can be included as part of a healthy, balanced diet. There are a few things worth considering.
Soy allergy: Soy-based tempeh isn’t appropriate for anyone with a soy allergy.
Thyroid medication: People with hypothyroidism generally don’t need to avoid soy. However, soy foods can interfere with the absorption of levothyroxine when eaten too close to the medication. If you take thyroid hormone replacement, follow your healthcare professional’s instructions about medication timing and soy consumption.
Added sodium: Plain tempeh may contain relatively little sodium, but flavored varieties, marinades, and sauces can add considerably more. Check the nutrition label if you’re limiting sodium.
Digestive tolerance: Tempeh may cause gas or digestive discomfort in some people, as can other soy and legume foods. Individual tolerance varies.
What’s the Healthiest Way to Eat Tempeh?
Rather than looking for one perfect cooking method, I prefer to think about the entire meal.
Try combining tempeh with plenty of vegetables and a minimally processed carbohydrate source such as brown rice, quinoa, sweet potato or another whole grain. You can also add a modest amount of unsaturated fat from foods such as nuts, seeds, avocado or vegetable oils.
Tempeh can be steamed, baked, grilled, air-fried or sautéed.
What you add to it matters too.
Deep-frying tempeh or covering it with a sauce containing large amounts of sodium or added sugar doesn’t erase the nutritional value of the tempeh itself, but it does change the overall nutritional profile of the meal.
The Bottom Line
Tempeh deserves attention not because it’s a miracle food, but because it combines several desirable nutritional qualities in one versatile ingredient.
It’s rich in high-quality plant protein and provides fiber, minerals, unsaturated fats, and soy isoflavones. Fermentation also transforms some of its proteins and phytochemicals, reduces certain antinutritional compounds and produces potentially beneficial bioactive compounds.
Research into tempeh’s possible effects on cardiovascular health, oxidative stress, metabolism and gut health is encouraging.
At the same time, we need to be careful about the strength of those claims.
A substantial portion of the evidence comes from research on soy generally, fermented soy foods collectively, laboratory experiments, or animal studies rather than large human clinical trials specifically testing tempeh.
So tempeh doesn’t need exaggerated health claims to be impressive.
It’s simply a nutrient-dense, protein-rich fermented soy food that can be a valuable part of a balanced diet.
And that’s already a very good reason to put it on your plate.
Frequently Asked Questions
1. Is tempeh healthier than tofu?
Not necessarily. They’re different foods with different nutritional advantages.
Tempeh generally contains more protein and fiber and retains more of the whole soybean. Tofu can be lower in calories per serving and may provide substantial calcium, particularly when calcium salts are used during manufacturing.
Both can be excellent additions to a healthy diet.
2. Is tempeh a complete protein?
Yes. Soy protein contains all nine essential amino acids, so soybean tempeh can serve as a high-quality plant protein source.
3. Can I eat tempeh every day?
For most healthy adults without a soy allergy or another medical reason to restrict soy, tempeh can be eaten regularly as part of a balanced diet.
That doesn’t mean you need to eat it every day. Including a variety of protein sources can provide a broader range of nutrients and make your diet more enjoyable.
4. Is tempeh good for your gut?
Possibly, but the evidence is still developing.
Fermentation changes the soybean and produces compounds that could influence the digestive environment. Tempeh also retains fiber from the soybeans.
However, because tempeh is generally cooked before consumption, it shouldn’t automatically be considered a reliable source of live probiotic microorganisms.
5. Is tempeh good for weight loss?
Tempeh doesn’t directly cause weight loss.
Its relatively high protein content can help make meals satisfying, which may make appetite management easier for some people. Ultimately, however, weight loss depends primarily on overall energy balance and long-term dietary and lifestyle habits.
6. Does tempeh contain estrogen?
Tempeh doesn’t contain human estrogen.
Soybeans contain isoflavones, which are sometimes called phytoestrogens because they can interact with estrogen receptors in the body.
However, phytoestrogens aren’t the same thing as human estrogen, and their effects can vary depending on the tissue, compound, dose, and individual.
7. Does cooking destroy tempeh’s benefits?
No.
Cooking can reduce living microorganisms and alter some heat-sensitive compounds, but cooked tempeh still provides protein, fiber, minerals, fats and numerous other nutrients.
Cooking is also the normal way tempeh is prepared for eating.
8. How much protein does tempeh contain?
Traditional soybean tempeh typically provides roughly 18–20 grams of protein per 100 grams, although the exact amount varies depending on the product, ingredients and preparation method.
Checking the nutrition label is the best way to determine the protein content of a particular product.
9. Is tempeh highly processed?
Traditional tempeh is generally considered a relatively minimally processed food.
The basic process involves preparing soybeans, inoculating them with a fermentation starter, and allowing the microorganisms to ferment and bind the beans into a compact cake.
Flavored or ready-to-eat tempeh products may contain additional oils, salt, sugar, and other ingredients, so check the ingredient list if you’re looking for a simpler product.
10. Who should avoid tempeh?
People with a soy allergy should avoid soy-based tempeh.
People taking medications whose absorption may be affected by soy, including levothyroxine, should follow their healthcare professional’s advice about timing. Anyone who has been advised to restrict soy or particular nutrients because of a medical condition should also follow individualized medical or dietary guidance.
Content Disclaimer
This article is provided for general informational and educational purposes only and isn’t intended to replace professional medical advice, diagnosis or treatment.
Research on tempeh, soy and fermented foods continues to evolve, and some proposed health benefits have stronger scientific support than others. Findings from laboratory experiments, animal studies or research on fermented soy products generally don’t necessarily establish the same effects from eating tempeh in humans.
Individual nutritional needs can also vary considerably. If you have a medical condition or food allergy, take prescription medication, are pregnant or breastfeeding, or are considering significant dietary changes for health reasons, consult a physician, registered dietitian or another qualified healthcare professional for individualized guidance.