Is Tofu Really Good For You?

Tofu is either the backbone of your diet if you're aiming to eat clean and plant-based, or it brings vague fears about hormones, cancer, or-if you've spent any time anywhere remotely internet-warnings about men developing 'moobs'. As is often the case in nutrition science, the reality is more complicated than the headlines and leans in tofu's favor.

What Is Real Tofu?

Making tofu involves curdling soy milk and then pressing the curds to form the blocks. Nutritionally, tofu can provide a good deal of nutritional value. You can consume 10-12 grams of complete protein, which indicates that it provides all nine essential amino acids that you cannot produce on your own and also acquire iron, magnesium, zinc, calcium and the B vitamins with 100 grams.

Talking about tofu, there is no way one can ignore certain compounds found in plants, which are isoflavones. And tofu is one of the richest food sources of isoflavones.

The Cancer Question

The thought of estrogen-like compounds feeding breast cancer tumors is, perhaps, the most terrifying notion associated with tofu, and it’s caused many women to avoid it entirely-sometimes even on doctor’s orders.

Yet, a substantial amount of research is beginning to reverse that trend. A 2024 meta-analysis published in Nutrients concluded that soy isoflavones were associated with a 26% reduction in breast cancer recurrence, with the highest protective effect observed at around 60mg of isoflavones a day.¹

Separately, a 2023 systematic review of 52 studies in a peer-reviewed journal found that higher intake of tofu, specifically, was linked with a 22% reduced risk of cancer in general.²

Interestingly, the review showed a reduction for tofu and soy milk only, for fermented soy products such as miso and natto, no link was found either way, indicating that perhaps a different blend of the beneficial bioactives is present in unfermented soy foods.

For prostate, colon, stomach and endometrial cancer, the research is similarly positive, with multiple studies indicating a 10-16% risk reduction associated with higher intake of soy foods.

The American Cancer Society has now indicated that soy foods can be consumed as part of a balanced and healthy diet but state more conclusive data is needed to recommend any specific prescription.

A Win For Your Heart

Because a combination of protein, fiber and isoflavones all play a role in heart health, which may explain why whole soy foods perform better than soy protein isolates at lowering cholesterol.

Another randomized controlled trial from Wageningen University confirmed this with a double-blind study, where healthy men eating tofu regularly experienced improvements in their LDL cholesterol and other markers for cardiovascular disease.³

If you consider that the standard alternative for many is often red meat, a food robustly linked with higher risk factors of heart disease, bowel cancer and early mortality, tofu is undoubtedly the better option.

Hormones, Fertility and the 'Man Boobs'

Myths about soy products decreasing testosterone, increasing estrogen or leading to feminization in men have been repeatedly investigated with consistently negative results in well-conducted clinical studies.

Overall, there is no statistically significant change to men's testosterone, sperm viability or fertility from eating moderate amounts of soy foods.

For women, the effects are less dramatic but appear to offer modest help for hot flushes, although studies vary on their effectiveness.

Preliminary research also links high soy consumption with lower rates of osteoporotic fractures in post-menopausal women, offering hope for improving bone health after changes to hormones post-menopause.

Protein Source

Tofu offers protein benefits many don’t consider. A 2024 study found that soy protein promotes muscle synthesis in a comparable way to whey protein after exercise, proving beneficial for those who don't consume animal protein.⁴

Tofu contains about 10-12g of protein in a 100g serving, but at a lower saturated fat content than animal proteins, and the carbon footprint of production is also far less. For anyone trying to increase protein intake without relying on large quantities of meat, tofu is a genuine alternative.

An additional health benefit being discovered in tofu research is its role in gut health. A 2023 randomized trial in Japan concluded that consumption of tofu rich in isoflavones not only relieved symptoms of constipation but also changed the gut microbiome.

What is the recommended intake?

The general recommendation is to have one to two servings of whole soy foods per day, as part of an overall nutritious diet, where the standard serving size would be about 100-150 grams of firm tofu.

Variety of intake from different types of soy products like tofu, tempeh, which is fermented tofu, and edamame should be sought out to obtain diverse benefits from soy products.

Consistent point across studies is that isoflavone supplements are not the same as the food. There are higher levels of concentration in supplements that do not have scientific data comparable to whole foods and vary in safety levels.

Tofu may not be the 'miracle' food, but science has shown tofu as a safe and nutritious food source, offering high-quality proteins, vitamins, minerals and other bioactive compounds that have proven to protect your heart, lower cancer risks and are harmless to hormone levels in your body.

FAQs

References:

1. Healthline.com | Tofu: Health Benefits and Risks

2. National Library of Medicine| Soy Product Consumption and the Risk of Cancer

3. National Library of Medicine | Effect of 4-Week Consumption of Soy Kori-tofu on Cardiometabolic Health Markers

4. Well Fit Insider | 10 Science-Backed Health Benefits of Tofu

Disclaimer: This content is for general informational purposes only and should not replace professional medical advice. Always consult a qualified healthcare provider with any questions about your health or treatment options.