Oats

Overview

Oats provide beta-glucan fibre (prebiotic), B vitamins, and minerals that support gut health, serotonin synthesis, and stable glucose release. Key contributions include magnesium, iron, selenium, and folate. Beta-glucans support gut microbiome health.

Key Nutritional Highlights

• Concentrated source of beta-glucan, the soluble oat fibre most linked to glycaemic and lipid benefits.
• Strong micronutrient profile for a grain, including magnesium, iron, selenium, and folate.
• Naturally gluten-free as a grain, though cross-contamination risk depends on sourcing/processing.
• Oat protein remains lysine-limited, so amino-acid balance improves when paired with legumes.

Food Context

Synergies

• Pair with tryptophan-rich proteins for serotonin synthesis; pair tryptophan-rich proteins with moderate carbs to increase Trp:LNAA ratio
• Best consumed in evening for calming effect; timing midday or evening for calming effect
• Part of grain-legume complementarity strategy; grains (typically lysine-limited) and legumes (methionine/cysteine-limited) complete each other's profiles when paired
• Tryptophan + complex carbohydrates aid serotonin conversion to melatonin; examples include pumpkin seeds + oats

Preparation

• Soak overnight to reduce phytates and improve mineral bioavailability

Essential Amino Acid Profile

Oats provide meaningful plant protein but are not a complete protein.

Limiting amino acids:

• Lysine (typical of grains)

Protein pairing strategy:

Oats are relatively higher in methionine than many legumes but lower in lysine. Combining oats with lentils, beans, or other legumes helps create a more balanced essential amino acid profile.

Recipes

no recipes found

Nutrient Tables (per 100 g)

Core nutrients

Nutrient	Amount per 100 g	% RDA per 100 g
Energy	378.9 kcal	—
Protein	13.5 g	—
Total fat	5.9 g	—
Saturated fat	1 g	—
Carbohydrates	68.7 g	—
Sugars	1 g	—
Fibre	10.4 g	—

Key micronutrients

Nutrient	Amount per 100 g	% RDA per 100 g
Iron	4.3 mg	24.1%
Zinc	2.7 mg	24.9%
Magnesium	126.3 mg	30.1%
Selenium	25.4 µg	46.1%
Calcium	45.5 mg	4.6%
Potassium	350.1 mg	10.3%
Copper	0.4 mg	44.4%
Choline	40.4 mg	7.3%
Folate	32 µg	8%
Vitamin B6	0.1 mg	7.9%
Vitamin E	0.4 mg	2.8%
Vitamin K	2.5 µg	2.1%

Bioactive compounds

Values below are often from specialist compositional databases or literature, not the standard USDA panel. Asterisks (*) refer to source notes at the bottom of this section.

Compound / class	Amount per 100 g	Notes
ALA	1400 mg	—
Beta-glucan	7.5 g *	Soluble cereal β-glucan; primary oat fibre fraction linked to lipid and glycaemic endpoints.

Note: Bioactive-compound values vary substantially by cultivar, species, cocoa or oil percentage, processing, and brand formulation. Show quantitative values only where a defensible source exists; otherwise prefer qualitative presence statements or ranges in source notes.

Source notes (bioactive / supplementary):

• * Beta-glucan: USDA FoodData Central Foundation food FDC 2346396 (footnote: beta-glucan values corrected in 10/2024 update). Varies by oat type (groats vs rolled vs instant) and processing.

Functional metrics

Metric	Score	Notes
Total phenolics (grain matrix)	Varies by cultivar and processing	Avenanthramides and other oat phenolics are not standard USDA panel rows; qualitative only here.

Note: Functional-metric values depend strongly on assay method, processing, and product formulation. Use these as contextual metrics, not strict like-for-like nutrient equivalents.

Reference intakes: US Dietary Reference Intakes for adults (19–50 years; using the higher of male/female values where they differ).

Data provenance (core / micronutrient panel): USDA FoodData Central, Oats, whole grain, rolled, old fashioned, FDC ID 2346396, API, per 100 g edible portion, last checked 2026-03-22

Substances

Substances in this food: editorial (Overview / literature) plus analytical (nutrition table).

14 substances in this food

Cu²⁺

Copper

Cofactor in redox enzymes; dopamine β-hydroxylase; iron metabolism interplay

Fe²⁺

Iron

Oxygen transport; dopamine synthesis (tyrosine hydroxylase cofactor)

Mg²⁺

Magnesium

Enzymatic cofactor (>300 reactions); neurotransmitters; mitochondria; redox balance

Se^2-

Selenium

Antioxidant enzyme cofactor (GPx); supports redox balance

Vitamin B9 (Folate; 5-MTHF)

One-carbon metabolism; methylation; homocysteine recycling

Zn²⁺

Zinc

Cofactor in neurotransmission and antioxidant enzymes; dopamine modulation

Ca²⁺

Calcium

Bone health; neurotransmission; interacts with vitamin D and K2

K⁺

Potassium

Electrolyte for nerve transmission, muscle function, and blood pressure regulation

Choline

Acetylcholine precursor; methyl donor; phospholipid synthesis for membranes

Vitamin B6 (Pyridoxine → PLP)

PLP cofactor for neurotransmitter synthesis; relies on brain PDXK activation

Vitamin E (Tocopherols/Tocotrienols)

Lipid-phase antioxidant; protects PUFA (DHA) in membranes

Vitamin K

ALA (Alpha-Linolenic Acid)

Essential omega-3 precursor; limited conversion to DHA/EPA

Beta-glucan

References

[1] Report recommending the Digestible Indispensable Amino Acid Score (DIAAS) as the preferred method for evaluating dietary protein quality, replacing PDCAAS, and detailing methodology and implications for human nutrition. FAO 2013. Protein quality evaluation framework (DIAAS)

[2] \textlessp\textgreaterWhile animal products are rich in protein, the adequacy of dietary protein intake from vegetarian/vegan diets has long been controversial. Mariotti & Gardner 2019. Plant-protein adequacy, limiting amino acids, and practical complementarity

[3] Brief Summary N-acyl-phosphatidylethanolamine (NAPEs) and their active metabolites, N-acyl-ethanolamides (NAEs) are lipid satiety factors that are normally biosynthesized in the intestinal tract in response to food intake. Sean Davies 2018. Oat bran lipid/phospholipid response study