What are the foods that contain the highest percentage of antioxidants?

Fruits, vegetables, and whole grains are among the richest dietary sources of antioxidants—chemicals that interact with and neutralize free radicals, preventing them from damaging cells. Consuming these foods regularly contributes to reducing the risk of chronic diseases such as cardiovascular disease and cancer, thanks to their diverse content of antioxidants and other beneficial compounds.

Our bodies produce some of the antioxidants they need, while we obtain the rest from external sources, primarily our diet. Antioxidants work to protect cells from oxidative stress caused by free radicals, which can cause cell damage and contribute to the development of chronic diseases. Research has shown that individuals who consume larger amounts of vegetables and fruits have a lower risk of chronic diseases. For example, a 2017 study of more than two million participants found that eating higher amounts of fruits and vegetables is associated with a lower risk of cardiovascular disease and cancer [1]. A 2023 British study also linked higher fruit and vegetable consumption with a lower risk of developing cataracts [1].

The Importance of Dietary Antioxidants

Antioxidants are vital components of the body's natural defense system against oxidative stress, which can lead to cell damage and contribute to chronic illness. While the body produces some antioxidants, food provides necessary additional sources. Evidence suggests that a diet rich in fruits and vegetables is linked to a lower risk of chronic diseases, including heart disease and cancer [1].

Foods Rich in Antioxidants

Foods rich in antioxidants generally include fruits, vegetables, and whole grains. Examples of foods containing antioxidants include vitamins C and E and beta-carotene. These compounds are found naturally in a wide range of plant-based foods [1]. It is believed that the health benefits of a diet rich in vegetables, fruits, or other antioxidant-rich foods may be due to other substances present in these foods or other aspects of people's lifestyles associated with consuming these foods [1].

Comparing Dietary Sources and Supplements

Although antioxidants are available in the form of dietary supplements, current evidence does not support the idea that antioxidant supplements can prevent chronic diseases such as cancer and cardiovascular disease [1][2]. In fact, high doses of some antioxidants, such as beta-carotene, may increase the risk of lung cancer, especially in smokers, and may increase the risk of death from cardiovascular disease [1].

The U.S. Preventive Services Task Force (USPSTF) recommends against using beta-carotene or vitamin E supplements to prevent cancer or cardiovascular disease. Antioxidants consumed as pure chemical compounds may not interact in the same way they do when consumed in foods, which contain a complex mixture of substances [1]. For more information about the benefits and risks, you can visit the article Antioxidants: Benefits and Risks (Arabic).

Practical Tips

To get the most out of antioxidants, it is recommended to focus on a varied diet rich in fruits, vegetables, and whole grains. Instead of relying on supplements, try to incorporate a wide range of colorful foods into your daily meals. For example, you can add fruits and vegetables to your main meals and snacks.

If you are considering taking antioxidant supplements, it is essential to consult your doctor first, especially if you are taking other medications or have certain health conditions. Some supplements may interact with medications or affect the effectiveness of certain treatments, such as cancer therapies [1][3]. It is important to inform healthcare providers of all medications and supplements you are taking.

Medical references

• Antioxidant Supplements: What You Need To Know
• Antioxidants and Cancer Prevention
• Coenzyme Q10 (PDQ®)–Patient Version