NutriDex

The Supplement Research Compendium
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Sweet Corn

A whole-grain vegetable rich in the macula-protective carotenoids lutein and zeaxanthin.

Moderate evidence 🥦Vegetables

✚ Updated · How we grade evidence

Evidence tier
Moderate
Research weight
Citations
11 verified / 11
Classification
Vegetables
❝
What the evidence says. Several controlled trials; effects real but modest or context-dependent.

Nutrition per serving 1 cup kernels, cooked/boiled, drained, no salt (164 g)

164gSERVING
  • Sugars 5.2 g3%
  • Fibre 4.6 g3%
  • Other carbs 31.4 g19%
  • Protein 5.4 g3%
  • Other 117.4 g72%
What's in one serving, by weight — average composition (USDA).
Vitamin C11%Fiber16%Potassium9%Folate19%Vitamin A2%Vitamin K1%Vitamin B66%Manganese14%
One serving as % of the adult daily requirement (FDA Daily Values). The bold outer ring = 100% of a day's needs.
177 kcal5.4 g protein4.6 g fiber5.2 g sugar
NutrientPer serving% daily value
Vitamin C10 mg11%
Fiber4.6 g16%
Potassium408 mg9%
Folate75 µg19%
Vitamin A21 µg2%
Vitamin K0.7 µg1%
Vitamin B60.1 mg6%
Manganese0.32 mg14%
Copper0.09 mg10%
Vitamin E0.15 mg1%
Magnesium52 mg12%
Calcium3 mg0%

Composition data: USDA FoodData Central ↗

What is Sweet Corn?

Sweet Corn is a vegetable used for dietary lutein/zeaxanthin associated with lower risk of late age-related macular degeneration. NutriDex grades the human evidence as Moderate. Sweet corn is botanically a whole grain, and its strongest human-evidence signal comes from its high content of the xanthophyll carotenoids lutein and zeaxanthin, which selectively accumulate in the retinal macula and brain. Cohort meta-analyses link higher dietary lutein/zeaxanthin to lower risk of late (advanced) age-related macular degeneration, and supplementation RCTs (including AREDS2) show modest slowing of AMD progression, especially in people with low baseline intake. As a whole grain, corn also fits the large dose-response evidence base associating whole-grain intake with reduced type 2 diabetes, cardiovascular disease, and all-cause mortality, though corn-specific RCTs on hard endpoints are lacking and most outcome data are observational.

Purported Benefits

✓Dietary lutein/zeaxanthin associated with lower risk of late age-related macular degeneration
✓Carotenoid supplementation raises macular pigment optical density and modestly slows AMD progression
✓Whole-grain intake linked to reduced type 2 diabetes and cardiovascular disease risk in cohorts
✓Fiber and resistant starch support satiety and gentler postprandial glucose responses
✓Provides folate, magnesium, potassium and antioxidant carotenoids

Dosing & Compounds

Typical Dose
Standard serving: 1 cup kernels, cooked/boiled, drained, no salt (164 g). Eat whole (with skin where edible); favour whole fruit over juice.
Active Compounds
LuteinZeaxanthinFerulic acid (hydroxycinnamic acid)Resistant starchInsoluble and soluble dietary fiberFolateBeta-carotene (yellow varieties)

Safety & Cautions

Generally very safe and a common dietary staple. The insoluble fiber and resistant starch can cause gas or bloating, and corn is a moderate-to-high FODMAP food (raffinose, sorbitol) that may aggravate IBS symptoms in sensitive individuals. Kernel hulls are poorly digested and may appear undigested in stool. Corn is a recognized though uncommon food allergen, and people with rare conditions affecting starch digestion should moderate intake. Canned and creamed products often add substantial sodium and sugar. Educational only — always check with your doctor or pharmacist before combining Sweet Corn with any medicine.

Key Studies ★ 11 studies

Meta-analysis Hu 2024 (Advances in Nutrition) ✓ Full text
Network meta-analysis of 38 RCTs found all antioxidant groups significantly raised macular pigment optical density and low-frequency contrast sensitivity; the lutein+zeaxanthin+fatty-acid combination ranked best for MPOD and lutein+zeaxanthin improved photostress recovery time.
meta-analysis of RCTs Li et al. 2021 ✓ Full text
Meta-analysis of RCTs found dietary lutein produced only small, non-significant improvements in complex attention (SMD 0.02), executive function (SMD 0.13) and memory (SMD 0.03), suggesting a possible role in maintaining rather than enhancing cognition.
dose-response meta-analysis Hou et al. 2022 ✓ Full text
Meta-analysis of 11 prospective cohorts (463,282 participants, 37,249 cases) found highest vs lowest whole-grain intake associated with 21% lower type 2 diabetes risk, ~23% lower risk per additional 50 g/day.
Meta-analysis Ma 2022 (Antioxidants / MPOD meta-analysis) ✓ Full text
Systematic review/meta-analysis found lutein/zeaxanthin intake raised MPOD by ~0.04 units (95% CI 0.02-0.07) at 5 to <20 mg/d and ~0.11 units (95% CI 0.06-0.16) at >=20 mg/d over 3-12 months, with doses <5 mg/d showing unclear effects.
dose-response meta-analysis Aune et al. 2016 ✓ PubMed
Dose-response meta-analysis (45 studies) found whole-grain intake inversely associated with coronary heart disease, cardiovascular disease, total cancer, and all-cause mortality, with risk reductions up to ~210-225 g/day.
Meta-analysis Jia 2017 / network meta-analysis update (PMC9610847, 2022) ✓ Full text
Systematic review and meta-analysis found lutein/zeaxanthin (with or without omega-3) supplementation significantly improved best-corrected visual acuity and delayed AMD progression compared with controls.
meta-analysis Ma et al. 2012 ✓ PubMed
Pooled cohort meta-analysis (6 longitudinal studies) found higher dietary lutein/zeaxanthin associated with reduced risk of late AMD (RR 0.74, 95% CI 0.57-0.97) and neovascular AMD (RR 0.68, 95% CI 0.51-0.92), with no significant effect on early AMD.
RCT Frontiers in Nutrition 2025 (Lute-gen RCT) ✓ Source
Randomized double-blind placebo-controlled trial in 70 high-screen-use adults found 10 mg lutein + 2 mg zeaxanthin isomers significantly improved Schirmer tear test (p<0.05), photo-stress recovery time (p<0.01), and tear film break-up time (p<0.05) versus placebo.
RCT (long-term follow-up) AREDS2 Report 28 (Chew et al.) 2022 ✓ Source
At 10-year follow-up, lutein/zeaxanthin versus no lutein/zeaxanthin was associated with a lower risk of progression to late AMD (HR 0.91, 95% CI 0.84-0.99, P=0.02).
RCT (crossover) Stewart et al. 2018 ✓ Full text
In a randomized controlled crossover trial in 21 healthy adults, substituting resistant starch type 4 for corn starch in a breakfast bar lowered postprandial glucose iAUC by ~22% and insulin iAUC by ~37%.
RCT (secondary analysis) AREDS2 Research Group (Chew et al.) 2013 ✓ Full text
In AREDS2 (n=4203), lutein+zeaxanthin showed no significant overall reduction in progression to advanced AMD (HR 0.90, P=0.12), but participants in the lowest baseline dietary intake quintile had a 26% lower risk (HR 0.74, 95% CI 0.59-0.94).
11 sources cited · 11 verified Search all studies on PubMed ↗

Common questions about Sweet Corn

What is Sweet Corn used for?

Sweet Corn is most often taken for Dietary lutein/zeaxanthin associated with lower risk of late age-related macular degeneration, Carotenoid supplementation raises macular pigment optical density and modestly slows AMD progression, Whole-grain intake linked to reduced type 2 diabetes and cardiovascular disease risk in cohorts, Fiber and resistant starch support satiety and gentler postprandial glucose responses. A whole-grain vegetable rich in the macula-protective carotenoids lutein and zeaxanthin.

Does Sweet Corn work — what does the evidence say?

Moderate evidence. Several controlled trials; effects real but modest or context-dependent. Sweet corn is botanically a whole grain, and its strongest human-evidence signal comes from its high content of the xanthophyll carotenoids lutein and zeaxanthin, which selectively accumulate in the retinal macula and brain. Cohort meta-analyses link higher dietary lutein/zeaxanthin to lower risk of late (advanced) age-related macular degeneration, and supplementation RCTs (including AREDS2) show modest slowing of AMD progression, especially in people with low baseline intake. As a whole grain, corn also fits the large dose-response evidence base associating whole-grain intake with reduced type 2 diabetes, cardiovascular disease, and all-cause mortality, though corn-specific RCTs on hard endpoints are lacking and most outcome data are observational.

What is the typical dose of Sweet Corn?

Standard serving: 1 cup kernels, cooked/boiled, drained, no salt (164 g). Eat whole (with skin where edible); favour whole fruit over juice.

Is Sweet Corn safe? Any cautions or side effects?

Generally very safe and a common dietary staple. The insoluble fiber and resistant starch can cause gas or bloating, and corn is a moderate-to-high FODMAP food (raffinose, sorbitol) that may aggravate IBS symptoms in sensitive individuals. Kernel hulls are poorly digested and may appear undigested in stool. Corn is a recognized though uncommon food allergen, and people with rare conditions affecting starch digestion should moderate intake. Canned and creamed products often add substantial sodium and sugar.

How many studies support Sweet Corn?

NutriDex cites 11 sources for Sweet Corn, graded "Moderate".

Cite this page
APA

Peh, D. (2026). Sweet Corn: Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 16 Sept 2026, from https://nutridex.info/s/sweet-corn

BibTeX
@misc{nutridex_sweet_corn,
  author       = {Peh, Daryl},
  title        = {Sweet Corn: Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/sweet-corn},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-09-16}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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