Antioxidants

What they are, where to find them — and why you don’t need an expensive superfood powder.

Antioxidants: What's All the Fuss About?

You've probably seen the claims.

Packed with antioxidants!

Fights free radicals!

The ultimate anti-ageing superfood!

Apparently, a handful of exotic berries or a rather expensive green powder is all that stands between us and eternal youth.

If only it were that simple.

Antioxidants are important, but the science is rather more interesting — and considerably less glamorous — than the marketing suggests.

The good news? You can find plenty of them in ordinary, everyday foods.

First, What Are Free Radicals?

Our bodies are constantly carrying out chemical reactions to keep us alive.

We breathe, digest food, produce energy, exercise and repair tissues. During these processes, our cells naturally produce molecules known as free radicals, including certain reactive oxygen species.

These molecules can react with other substances in our cells.

In excessive amounts, they can contribute to damage to proteins, fats and DNA.

But here's something important: free radicals aren't all bad.

Our bodies actually use reactive molecules for essential jobs, including immune defence and cell signalling. Exercise also temporarily increases some of these molecules, helping trigger beneficial adaptations.

So the goal isn't to eliminate free radicals. It's to maintain a healthy balance.

What Is Oxidative Stress?

Oxidative stress occurs when the production of reactive molecules exceeds the body's ability to manage them.

Over time, excessive oxidative stress can contribute to cellular damage and is associated with ageing and various chronic diseases.

However, oxidative stress is only one part of a complicated picture. It doesn't mean that every health problem is caused by free radicals or that taking more antioxidants will prevent disease.

Our bodies already have sophisticated systems for managing oxidative stress.

And this is where antioxidants come in.

So What Are Antioxidants?

Antioxidants are substances that can help prevent or limit certain types of oxidative damage.

Some are produced naturally by the body. Others come from the food we eat.

Important dietary examples include:

Antioxidant or related compoundEveryday food sourcesVitamin CPeppers, oranges, kiwis, strawberries, broccoliVitamin EAlmonds, sunflower seeds, vegetable oilsCarotenoids, including beta-caroteneCarrots, sweet potatoes, spinach, kaleLycopeneTomatoes, particularly cooked tomato productsPolyphenolsBerries, apples, tea, coffee, cocoa, herbs and spicesSeleniumFish, eggs, meat, some nuts and seeds

Selenium is a mineral that helps the body's own antioxidant enzymes function, rather than acting in quite the same way as vitamin C.

Different compounds work in different ways. That's one reason variety matters.

Why Eating the Rainbow Makes Sense

You've probably heard the advice to eat the rainbow.

It's not just about making your plate look pretty.

Different coloured fruits and vegetables contain different combinations of vitamins, minerals, fibre and plant compounds.

For example:

• Red: Tomatoes, strawberries, red peppers.

• Orange and yellow: Carrots, sweet potatoes, squash, oranges.

• Green: Spinach, broccoli, kale, peas.

• Blue and purple: Blueberries, blackberries, aubergines.

• White and brown: Cauliflower, onions, garlic, mushrooms.

And don't forget beans, lentils, nuts, seeds and wholegrains.

You don't need every colour at every meal. Aim for variety across the week.

The benefit comes from your overall dietary pattern, not from collecting individual miracle ingredients.

Are Superfoods Really Super?

Blueberries are nutritious.

So are broccoli, oats, lentils, carrots and apples.

But the term superfood has no precise scientific definition.

It's largely a marketing label.

An expensive imported berry might contain useful plant compounds, but that doesn't necessarily make it healthier than blackcurrants from your freezer.

And a green powder containing 25 supposedly miraculous ingredients isn't automatically better than eating a varied diet.

Whole foods provide combinations of nutrients, fibre and other compounds that work together in ways we're still learning about.

There's also much stronger evidence for the health benefits of eating patterns rich in plant foods than for taking isolated antioxidant products.

You don't need exotic ingredients to eat well.

Frozen berries count. Tinned tomatoes count. Ordinary vegetables count.

Your shopping bill doesn't need to become a wellness status symbol.

What About Antioxidant Supplements?

This is where things become particularly interesting.

We know that diets rich in fruit and vegetables are associated with better long-term health.

So surely taking large doses of antioxidants in supplement form would offer even greater protection?

Not necessarily.

Large clinical trials have generally failed to show that high-dose antioxidant supplements prevent major chronic diseases in otherwise well-nourished people.

Some have even identified risks.

For example, high-dose beta-carotene supplements have been shown to increase lung cancer risk in people who smoke or have significant asbestos exposure.

High doses of certain other antioxidant supplements can also have unwanted effects.

And because some reactive molecules are involved in the body's adaptations to exercise, taking large doses of vitamins C and E around training may interfere with some beneficial training responses, although findings are not entirely consistent.

This doesn't mean supplements are always unnecessary.

They can be valuable when there's a diagnosed deficiency, a particular dietary requirement or a specific medical recommendation.

But more isn't automatically better, particularly when it comes to high-dose antioxidant products.

Antioxidants and Ageing

Oxidative damage is one of several processes involved in biological ageing.

But ageing is complicated. Genetics, inflammation, metabolic health, lifestyle and many other factors all play a part.

No antioxidant supplement has been convincingly shown to stop or reverse human ageing.

What does have a much stronger evidence base?

Regular physical activity, a nutritious dietary pattern, adequate sleep, avoiding smoking and managing established health risks.

Perhaps not as exciting as a £60 tub of anti-ageing powder.

But rather more useful.

Simple Ways to Get More Antioxidant-Rich Foods

You don't need to overhaul your diet.

Try adding a few ordinary foods to meals you already enjoy:

• Add frozen berries to yoghurt or porridge.

• Include vegetables with lunch as well as supper.

• Use tinned tomatoes in sauces, soups and casseroles.

• Snack on fruit or a handful of nuts.

• Add beans or lentils to familiar dishes.

• Use herbs and spices to add flavour.

• Choose a variety of plant foods throughout the week.

Tea and coffee also contain polyphenols, although that doesn't mean drinking unlimited amounts is beneficial.

And remember, antioxidant content is only one reason to eat these foods. Their fibre, vitamins, minerals and other nutritional properties matter too.

A Few Questions Worth Asking Yourself

1. Am I eating a reasonable variety of fruits and vegetables?

2. Do I tend to eat the same few plant foods every day?

3. Could I add another colour to my meals?

4. Do I sometimes assume expensive foods must be healthier?

5. Have I bought supplements without really knowing whether I need them?

6. Am I influenced by words such as detox, anti-ageing or superfood?

7. Could frozen, tinned or seasonal produce make eating well easier?

8. Am I focusing on individual nutrients rather than my overall diet?

9. What's one simple improvement I could make this week?

A Little Experiment: Add, Don't Overcomplicate

For the next seven days, notice how many different plant foods you eat.

You don't need to count obsessively. Just look for opportunities to introduce variety.

What I already eatSomething I could addAn easy way to do itPorridgeBerriesAdd a handful of frozen berriesSandwichSalad vegetablesAdd tomatoes, leaves or peppersPastaBeans or vegetablesStir into the sauceEvening mealAnother vegetableAdd a side portionSnackFruit or nutsKeep something convenient available

The aim isn't perfection. It's making nutritious choices a little easier and more habitual.

A Final Thought

Antioxidants matter. Oxidative stress matters.

But the idea that we can prevent ageing and disease simply by flooding our bodies with antioxidant supplements is not supported by good evidence.

Our bodies are more complicated than that.

A varied diet provides an enormous range of nutrients and plant compounds, many of which work together in ways we don't fully understand.

And fortunately, eating well doesn't require an expensive collection of powders, potions or fashionable berries.

Sometimes a carrot really is just a very good carrot.

Something to think about, don't you think?

The Psychology Behind This Sheet — And the Science

• Sies, H. (2015). Oxidative Stress: A Concept in Redox Biology and Medicine. Redox Biology. Explains oxidative stress and the important distinction between harmful oxidative damage and normal biological signalling.

• Bjelakovic, G. et al. (2012). Antioxidant Supplements for Prevention of Mortality in Healthy Participants and Patients with Various Diseases. Cochrane Database of Systematic Reviews. Found no overall mortality benefit from antioxidant supplementation and identified potential harms from some supplements.

• National Institutes of Health — NCCIH. Antioxidants: In Depth. Accessible summary of antioxidant research, including limitations and safety concerns around supplements.

• NHS. 5 A Day. Practical advice on fruit and vegetable intake, including fresh, frozen, dried and tinned options.

FUSION FIT
MOVE WELL • EAT WELL • LIVE WELL

This handout provides general nutrition education and is not a substitute for individual medical or dietetic advice. Speak to an appropriate healthcare professional before taking high-dose supplements, particularly if you take medication or have an existing health condition.