Updated: Sep 14
Antioxidants are just that: they fight (anti) oxidation. They're like the superheroes of food.
The chemical process of oxidation is like rusting metal.
A molecule loses electrons and creates the infamous free radicals. Oxidation is also the reason why apples, bananas, and avocados go brown when the skin is broken, and they're exposed to air - they're getting oxidized.
Free radicals in the body cause inflammation and can contribute to diseases like cancers, diabetes, and heart disease (to name a few). So, the antidote to oxidation is the antioxidant. Vitamins like vitamins A, C, and E are examples of antioxidants. So are other compounds in foods like carotenoids and phenols. These compounds sacrifice their electrons to stop the oxidation process; this why squirting some lemon juice on your sliced apples, bananas and avocados slows down the browning process.
But don’t think that all oxidation in the body is bad. It’s not. Your body naturally oxidizes compounds all the time when it’s doing healthy things like metabolizing nutrients or exercising.
As with many things in life and health, the key is maintaining a good balance. In this case, it's the balance between oxidation and anti-oxidation.
We can throw off that balance with exposure to too much alcohol, smoking, or environmental pollutants. Even over-exercising or too much sun exposure can create too much oxidation.
The best sources of antioxidants to combat this effect are nutritious whole foods, like colourful fresh produce, e.g., blueberries, purple cabbage, etc. In fact, the more colourful and darker the plant is, the higher levels of antioxidants it usually has. Chemicals that give the plants their deep colours are often the antioxidants themselves.
Antioxidants in food
Let me list out a bunch of antioxidants and the foods they’re found in:
Vitamin A - Found in liver, dark leafy greens (e.g., kale), orange fruits and veggies (e.g., mangoes, carrots & squashes)
Vitamin C - Found in bell peppers, citrus, berries, and leafy greens
Vitamin E - Found in leafy greens, nuts (e.g., walnuts), and seeds (e.g., sunflowers)
Carotenoids (e.g., beta-carotene, lycopene, etc.) - Found in tomatoes, carrots, squash, sweet potatoes, and salmon
Phenols - Found in green tea, black tea, coffee, cocoa, red wine, and berries
Blueberries are probably one of the most studied antioxidant foods. They contain a range of phytochemical (i.e., plant chemical) compounds and are very high in anthocyanins - the blue-coloured compound).
The antioxidant capacity can be measured in a laboratory; this is called the "oxygen radical absorption capacity," or "ORAC." And blueberries have one of the highest ORAC levels.
FUN FACT: Some studies estimate that the highest source of antioxidants in the average American is not from berries, it's from coffee! Can you imagine how much healthier people can be if they added a few more servings of antioxidant-rich fruits and vegetables to their days?
Antioxidant Foods vs. Supplements
So much controversy here. Compared with eating a nutrient-dense antioxidant-rich colourful array of plants, antioxidants supplements have fallen short, in some studies.
That said, I find that most of my clients don't get enough of nutrient-dense foods that they need on a daily basis. Neither is my own family consistent, which is why we all have our own supplement regime.
When it comes to supplementation, you need to be careful and work with someone trained in supplementation.
Some amazing go-to micronutrients are contraindicated with certain medications, like as in the case of fish oil and blood pressure medication.
And over-doing it on supplements can actually lead to health problems.
In fact, too much of any individual antioxidant, like when overdoing supplements, can be harmful. Too much vitamin A is linked to increased risk of hip fractures and prostate cancer. Too much beta-carotene increases the risk of lung cancer in smokers. Too much vitamin E increases the risk of prostate cancer, lung infections, heart failure, and even death.
One of the reasons why antioxidant foods might work better than antioxidant supplements is because of synergy.
The concept of synergy means that by taking one component out of healthful food (i.e., the antioxidant), it loses the effect it has when combined with all the other healthy components it came with from nature. This is the difference between eating a whole orange and taking a vitamin C supplement. The orange is going to have more than just vitamin C, and many of those compounds will work together for overall health better than just isolating one and having higher-than-normal doses of it.
There is also the question of the fibre that comes with the food, designed to pick up and remove waste versus a low fibre diet that is high in supplementation.
I think the one exception to the rule though, would be vitamin C IV therapy. I love it and have been doing it for years. IV therapy allows the vitamin C to bypass the digestive tract and directly enter the blood stream for maximum impact. It has helped me personally with stress management, digestive issues and keeping my immune system strong during flu season. I've used it for pre- or post-airline travel and my son used it to help recover from his concussion.
If you need a recommendation on IV therapy, let me know.
There are antioxidant vitamins (A, C & E) and other antioxidants like carotenoids and polyphenols. They're highest in colourful fruits and vegetables, nuts and seeds, some meats, tea, coffee, and cocoa.
You can’t replace a diet full of nutrient-dense antioxidant-rich whole foods with supplements. So stick with the foods.