Nutrition Facts with Dr. Greger

Everything You’ve Always Wanted to Know About Antioxidants

September 25, 2025

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  • Consuming whole foods, particularly fruits and vegetables, is crucial for obtaining beneficial antioxidants, as dietary supplements may be less effective or even detrimental to health. 
  • Antioxidant-rich foods, especially berries, can help mitigate the pro-oxidant effects of meals, improving blood antioxidant levels and potentially counterbalancing the negative impacts of a standard Western diet. 
  • While antioxidants are linked to improved mood and reduced depression, the benefits are derived from food sources, not supplements, and other dietary factors like folate also play a significant role in mental well-being. 

Segments

Highest Antioxidant Foods
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(00:00:18)
  • Key Takeaway: Granny Smith apples and walnuts offer superior antioxidant content compared to other common fruits and nuts, respectively.
  • Summary: Certain apple varieties, like Granny Smith, possess significantly higher antioxidant levels than others. Among nuts, walnuts lead in antioxidant capacity, followed by pecans and pistachios, with almonds ranking lowest. Walnuts also demonstrate benefits for artery function and omega-3 content.
Antioxidants and Depression
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(00:02:44)
  • Key Takeaway: Higher intake of fruits and vegetables, rich in antioxidants and folate, is associated with a lower risk of depression, but only from food sources, not supplements.
  • Summary: Evidence suggests that oxidative stress may contribute to depression. Consuming fruits and vegetables is linked to reduced odds of depression, psychological distress, and anxiety disorders. This protective effect is attributed to antioxidants and folate found in whole foods, not from antioxidant supplements.
Antioxidants with Meals
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(00:08:09)
  • Key Takeaway: Incorporating antioxidant-rich plant foods with every meal is essential to counteract the pro-oxidant state induced by eating and maintain overall health.
  • Summary: The body enters a pro-oxidant state after meals, necessitating a continuous intake of antioxidants. Plant-based foods, particularly berries, can help balance the negative effects of meals, even high-fat ones, by increasing blood antioxidant capacity and preventing oxidative damage.