A leading Japanese cancer researcher has identified ten everyday ingredients and five easy-to-make soups that may significantly lower cancer risk—and in some cases, slash mortality rates by up to 50 percent. Professor Norihiro Sato, an oncology expert at Teikyo University’s Fukuoka College of Medical Technology, explains that decades of scientific evidence now point to specific dietary choices that reinforce the immune system, improve gut health, and help block the biological pathways that allow tumors to grow.
The Top 10 Anti-Cancer Foods
Professor Sato’s list draws on compounds that have been shown in peer-reviewed studies to interfere with cancer development at the cellular level. Here is what he recommends adding to your shopping basket:
Cruciferous vegetables – Broccoli, cabbage, kale, and their relatives contain glucosinolates and sulforaphane, potent antioxidants that help neutralize carcinogens and suppress the proliferation of malignant cells.
Fatty fish – Salmon, mackerel, and sardines are rich in omega-3 fatty acids, which reduce chronic inflammation—a known driver of many cancers.
Soy products – Tofu, edamame, and tempeh provide genistein, an isoflavone that inhibits angiogenesis (the formation of new blood vessels that feed tumors). Studies link soy consumption to a roughly 50 percent lower risk of death from stomach, colorectal, and ovarian cancers.
Allium vegetables – Onions, garlic, leeks, and chives deliver quercetin and other sulfur compounds with strong antioxidant and anti-inflammatory effects, also supporting heart health and blood sugar control.
Mushrooms – Shiitake, maitake, and other varieties offer beta-glucans, which stimulate immune cells. A meta-analysis found that people who ate mushrooms regularly had a 34 percent lower overall cancer risk.
Seaweed – Wakame, kombu, and nori contain fucoidan, a polysaccharide that has been shown to induce apoptosis (programmed cell death) in cancer cells and block tumor-feeding blood vessels.
Tomatoes – The star compound lycopene is a powerful antioxidant that inhibits cell proliferation and angiogenesis. Cooking tomatoes (as in soups or sauces) increases lycopene absorption.
Carrots – Rich in beta-carotene and fiber, carrots are linked to a 42 percent lower lung cancer risk in high-consumption groups. Professor Sato cautions that store-bought carrot juice often lacks fiber, so eating whole carrots is preferable.
Fresh fruit – A Japanese cohort study showed that eating fruit at least once per week reduced stomach cancer risk by 30 percent compared to those who rarely ate fruit. Whole fruits are better than juice due to added sugars in commercial products.
Nuts – Almonds, walnuts, and other nuts supply ellagic acid, vitamin E, and alpha-linolenic acid (an omega-3), offering a dense package of antioxidants and anti-inflammatory compounds.
Five Simple Soups to Fortify Your Defenses
Beyond listing ingredients, Professor Sato offers five broth-based recipes that combine these protective foods into flavourful, everyday meals. Each soup is designed to be quick to prepare (under 20 minutes) and uses accessible ingredients.
Tomato and Chicken Tender Soup – Lycopene from cooked tomatoes pairs with lean protein to support immune function. The recipe calls for one tomato, one chicken tender, a touch of cornstarch, broth, and yuzu pepper for a gentle kick.
Seaweed, Yam, and Milk Soup – Fucoidan from wakame, immune-boosting polysaccharides from Chinese yam (huai shan), and milk protein create a creamy, calcium-rich bowl that may help suppress tumour growth.
Cabbage and Garlic Soup – Cabbage provides sulforaphane and fibre for gut health, while garlic’s allicin enhances immune cell activity. Sautéed garlic and chili in olive oil form the fragrant base.
Burdock Root and Beef Soup – Burdock root is loaded with inulin and polyphenols that improve gut flora and combat oxidative stress. Thinly sliced burdock and beef are quick-fried in sesame oil, then simmered with mirin and soy sauce.
Seaweed and Kimchi Soup – A no-cook option: rehydrated wakame, fermented kimchi (rich in probiotics), and a splash of oyster sauce. This soup combines fucoidan with gut-friendly live cultures to strengthen immunity.
A Diet That Works with Modern Lifestyles
Professor Sato’s advice underscores a growing consensus among oncologists: while no single food can guarantee prevention, a diet rich in whole plant foods, healthy fats, and fermented ingredients can create a cellular environment that is less hospitable to cancer. The soups, in particular, offer a practical way to incorporate multiple protective compounds into one meal—ideal for busy Hong Kong households.
Individuals with existing health conditions or those undergoing treatment should consult their physician before making significant dietary changes. For most people, however, these ingredients are safe, affordable, and widely available at local markets. As research continues to validate the link between plate and prognosis, the humble soup pot may prove to be one of the most accessible tools in cancer prevention.