What the Heck Are Plant “Toxins” - November 2026 News from Gut Healthy
Published 1 day ago • 4 min read
November 2026
And Should I Be Eating Them?
You’ve probably heard the advice to “eat the rainbow,” and you probably know that eating fruits and vegetables is good for you. But why? And what the heck are plant “toxins”?
Plants produce thousands of natural chemical compounds to help protect themselves against insects, bacteria, fungi, and other threats. Some can be harmful to humans in sufficient quantities, but many, known as phytochemicals, are being studied for their potential health benefits.
Unlike protein, fats and carbohydrates, phytochemicals aren’t essential nutrients we need in specific amounts. However, many have antioxidant and anti-inflammatory properties and may help protect cells and support long-term health.
Found in fruits, vegetables, legumes, whole grains, nuts, seeds, and spices, phytochemicals can also give plants their vibrant colours, distinctive flavours, and aromas. Think of deep-red berries, purple cabbage, orange carrots, and pungent garlic.
Eating a variety of plant foods helps us benefit from a broad range of these compounds. That’s the idea behind “eating the rainbow.”
Here are seven plant compounds worth knowing about:
1. Resveratrol
Why it’s interesting: This compound has antioxidant and anti-inflammatory properties and is being studied for its potential effects on cardiovascular health and healthy aging.
Found in: Red and purple grapes, peanuts, pistachios, blueberries, and cranberries.
2. Sulforaphane
Why it’s interesting: Formed from a precursor in cruciferous vegetables, sulforaphane is being studied for its role in cellular protection and the body’s response to oxidative stress.
Found in: Broccoli, broccoli sprouts, cabbage, cauliflower, Brussels sprouts, and kale.
3. Allicin
Why it’s interesting: Produced when garlic is chopped or crushed, allicin has antimicrobial properties and is being investigated for its potential cardiovascular benefits.
Found in: Fresh garlic.
4. Quercetin
Why it’s interesting: This flavonoid has antioxidant and anti-inflammatory properties and is being studied for its effects on inflammation and blood vessel function.
Found in: Apples, onions, capers, kale, spinach, blueberries, broccoli, and grapes.
5. Capsaicin
Why it’s interesting: Responsible for the heat in chilli peppers, capsaicin activates receptors involved in sensing heat and pain. It’s also used in some topical pain treatments.
Found in: Cayenne, jalapeños, habaneros, and other hot peppers.
6. Ferulic acid
Why it’s interesting: This antioxidant compound is being studied for its potential role in protecting cells from oxidative damage.
Found in: Whole grains such as oats and some vegetables.
7. Genistein
Why it’s interesting: This soy isoflavone interacts with estrogen receptors and has been studied for its potential effects on bone and cardiovascular health.
Found in: Soybeans, tofu, tempeh, edamame, and soy milk.
How can you get more into your day?
You don’t need to memorize chemical names or buy supplements. A few simple habits can help you enjoy a wider variety of phytochemicals:
Add colour to your plate. Enjoy a mix of berries, leafy greens, orange vegetables, and purple cabbage.
Eat cruciferous vegetables regularly. Add broccoli to stir-fries, roast cauliflower, or toss shredded cabbage into salads.
Make garlic a kitchen staple. Chop or crush it and let it sit for a few minutes before cooking to allow allicin to form.
Enjoy fruit regularly. Add berries to oatmeal, snack on apples or blend fruit into a smoothie. Eat the skin when practical.
Include soy foods. Tofu, tempeh, and edamame provide genistein along with protein and other nutrients.
Use herbs and spices generously. Garlic, ginger, turmeric, oregano, thyme, and chilli peppers add flavour and a variety of plant compounds.
The compounds plants produce to protect themselves may also help protect our health. While research into individual phytochemicals continues, we don’t need to chase specific compounds or the latest superfood to benefit.
Eat a variety of whole plant foods, enjoy different colours and flavours, and let nature do the rest. That’s a pretty good reason to eat the rainbow!
Be well, Peggy
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