Children with high LDL cholesterol are at greater risk of developing early arterial changes that can lead to heart disease later in life. In some cases, the elevated LDL levels are caused by inherited lipid disorders. Earlier research from the EARLY (Endothelial Assessment of Risk from Lipids in Youth) trial, published in Circulation (2003), found that antioxidant supplements improved measures of vascular health in children with genetic hyperlipidemia.

Antioxidants—such as vitamins A, C, and E—help protect the body from oxidative stress, which plays a role in atherosclerosis. Previous studies have shown that diets rich in fruits and vegetables lower cardiovascular risk in adults, partly due to naturally occurring antioxidants.

This early research was promising, but modern studies tend to focus more on whole-food dietary patterns rather than isolated antioxidant supplements.

What Newer Research Shows

Recent studies (2015–2024) continue to connect the dots between LDL, oxidative stress, and vascular health in children:

  • Oxidative stress strongly contributes to early artery dysfunction in kids with high LDL, reinforcing why antioxidant-rich foods matter.¹

  • Vitamin C supplementation improved endothelial function (a marker of blood vessel health) in adolescents.²

  • A Mediterranean-style diet—rich in fruits, vegetables, legumes, and olive oil—improves endothelial function in children with dyslipidemia.³

  • Polyphenol-rich foods reduce LDL oxidation in obese youth, an important factor in early atherosclerosis.⁴

Together, this research supports the idea that antioxidant intake—especially from whole foods—may help protect vascular health in children with elevated LDL.

Bottom Line

  • Antioxidants matter, but whole foods are the best source.

  • Improving diet quality in childhood—especially in those with high LDL—may improve markers of cardiovascular health and help protect long-term wellness.

  • Supplements should only be used under the supervision of doctors trained in natural healthcare.

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References 

  1. American Academy of Pediatrics Oxidative Stress Is Associated With Arterial Dysfunction and Enhanced Intima-Media Thickness in Children With Hypercholesterolemia: The Potential Role of Nicotinamide-Adenine Dinucleotide Phosphate Oxidase
  2. Circulation 11 August 2003 Volume 108, Number 9 Antioxidant Vitamins C and E Improve Endothelial Function in Children With Hyperlipidemia: Endothelial Assessment of Risk from Lipids in Youth (EARLY) Trial
  3. Nutrients 2020, 12(6), 1600;  Association between Serum Lipid Levels in Greek Children with Dyslipidemia and Mediterranean Diet Adherence, Dietary Habits, Lifestyle and Family Socioeconomic Factors
  4. Serum oxidized low-density lipoprotein levels are related to cardiometabolic risk and decreased after a weight loss treatment in obese children and adolescents.
    Pediatric Diabetes. 2017;18(7):573–581.