Lentils
Overview
Lentils are a staple legume in the BRAIN Diet, providing plant protein, fiber, folate, iron, and prebiotic compounds that support gut health and neurotransmitter synthesis. Lentils have a DIAAS score of 65-70, indicating they are methionine/cysteine-limited and should be paired with grains for complete amino acid profile. Lentils are listed as sources for iron, zinc, and glutamate synthesis, supporting neurotransmitter pathways.
Recipes
2 recipes containing this food
Rocket Lentil Avocado Midday Salad (Gut-Supporting)
Polyphenol-rich midday salad with quinoa or lentils, vegetables, avocado, and early harvest olive oil
Turmeric Lentil Dahl
Turmeric- and ginger-spiced lentil dish rich in fibre, folate, and polyphenols
Substances
21 substances in this food
Acetate
Most abundant SCFA supporting gut barrier integrity and immune regulation
Copper
Cofactor in redox enzymes; dopamine β-hydroxylase; iron metabolism interplay
Histidine
Essential AA; precursor to histamine; roles in enzyme active sites
Iron
Oxygen transport; dopamine synthesis (tyrosine hydroxylase cofactor)
Isoleucine
Essential BCAA; energy metabolism; complements leucine/valine
Leucine
Essential BCAA; mTOR signaling; protein synthesis; cognitive load support
Lysine
Essential AA; limiting in many cereals; complements legumes
Magnesium
Enzymatic cofactor (>300 reactions); neurotransmitters; mitochondria; redox balance
Manganese
Cofactor for MnSOD (SOD2); mitochondrial antioxidant defense
Methionine
Essential AA; precursor to SAMe via methylation cycle
Phenylalanine
Essential AA; precursor to tyrosine → catecholamines
Potassium
Electrolyte for nerve transmission, muscle function, and blood pressure regulation
Propionate
SCFA supporting neuroinflammation reduction, blood-brain barrier protection, and neurotransmitter regulation
Threonine
Essential AA; structural proteins; mucin production
Tryptophan
Serotonin/melatonin precursor; NAD+ pathway substrate; LAT1 transport dynamics
Tyrosine
Dopamine and norepinephrine precursor; LAT1 competition with LNAAs
Valine
Essential BCAA; supports protein balance and neurotransmitter transport competition
Vitamin B1 (Thiamine)
Mitochondrial glucose metabolism; ATP synthesis; rapid turnover in CNS
Vitamin B6 (Pyridoxine → PLP)
PLP cofactor for neurotransmitter synthesis; relies on brain PDXK activation
Vitamin B9 (Folate; 5-MTHF)
One-carbon metabolism; methylation; homocysteine recycling
Zinc
Cofactor in neurotransmission and antioxidant enzymes; dopamine modulation
Preparation Notes
- Soak and cook thoroughly to reduce phytates and improve mineral bioavailability; soaking and sprouting reduces phytates in legumes/grains, improving non-heme iron and zinc bioavailability
- Pair with grains for complete amino acid profile; grain-legume complementarity improves essential amino-acid coverage
- Pair with vitamin C sources to enhance iron absorption, with studies showing up to a fourfold increase when consumed together Hallberg et al. 1989
- Source of prebiotic fiber (GOS - galactooligosaccharides) supporting gut microbiome health
Biological Target Matrix
| Biological Target | Substance | Contribution Level | Therapeutic Areas | Mechanism of Action |
|---|---|---|---|---|
| Gut–Brain Axis & Enteric Nervous System (ENS) | Acetate | Contextual / minor contributor | Byproduct of fibre fermentation; supports intestinal barrier integrity; regulates immune responses; promotes synthesis of key neurotransmitters such as dopamine and serotonin | |
| Gut–Brain Axis & Enteric Nervous System (ENS) | Propionate | Contextual / minor contributor | Byproduct of fibre fermentation; supports intestinal barrier integrity; regulates immune responses | |
| Inflammation & Oxidative Stress | Acetate | Contextual / minor contributor | Supports immune regulation and anti-inflammatory processes | |
| Inflammation & Oxidative Stress | Copper | Contextual / minor contributor | Participates in redox enzymes and antioxidant networks | |
| Inflammation & Oxidative Stress | Propionate | Contextual / minor contributor | Helps reduce neuroinflammation and protects the blood-brain barrier; enhances cognitive function | |
| Inflammation & Oxidative Stress | Zinc | Contextual / minor contributor | Supports immune signaling; gut barrier integrity disrupted by nutrient deficiencies including zinc | |
| Metabolic & Neuroendocrine Stress (HPA Axis & ANS) | Magnesium | Contextual / minor contributor | Helps manage stress responses; combined with vitamin D reduced behavioral problems; synergy with zinc and omega-3s reported | |
| Methylation & One-Carbon Metabolism | Methionine | Contextual / minor contributor | Essential amino acid that forms S-adenosylmethionine (SAMe), the universal methyl donor for neurotransmitter synthesis and membrane phospholipid methylation | |
| Methylation & One-Carbon Metabolism | Vitamin B6 (Pyridoxine → PLP) | Contextual / minor contributor | Essential cofactor in remethylation of homocysteine to methionine, which is converted to S-adenosylmethionine (SAMe); works with B2, folate, and B12 | |
| Methylation & One-Carbon Metabolism | Vitamin B9 (Folate; 5-MTHF) | Contextual / minor contributor | Essential cofactor in remethylation of homocysteine to methionine, which is converted to S-adenosylmethionine (SAMe); SAMe fuels synthesis of dopamine, norepinephrine, and serotonin and drives phospholipid methylation in neuronal membranes | |
| Methylation & One-Carbon Metabolism | Zinc | Contextual / minor contributor | Deficiencies in vitamins and minerals essential for methylation, such as folate, vitamin B12, and zinc, are correlated to ADHD symptoms; supplementing these micronutrients has shown potential in supporting methylation and reducing symptom severity | |
| Mitochondrial Function & Bioenergetics | Iron | Contextual / minor contributor | Critical for oxygen delivery to the brain via hemoglobin; supports mitochondrial function and energy production | |
| Mitochondrial Function & Bioenergetics | Magnesium | Contextual / minor contributor | Supports enzymes involved in glycolysis and the Krebs cycle (processes that generate ATP from glucose); binds to ATP and all triphosphates in cells to activate them | |
| Mitochondrial Function & Bioenergetics | Manganese | Contextual / minor contributor | Supports mitochondrial antioxidant defense through MnSOD activity | |
| Mitochondrial Function & Bioenergetics | Vitamin B1 (Thiamine) | Contextual / minor contributor | Essential for mitochondrial glucose metabolism in the brain leading to ATP production; supports PDH (pyruvate dehydrogenase) and α-KGDH (alpha-ketoglutarate dehydrogenase) function | |
| Neurotransmitter Regulation | Copper | Contextual / minor contributor | Cofactor in dopamine β-hydroxylase, supporting catecholamine synthesis; supports norepinephrine synthesis | |
| Neurotransmitter Regulation | Iron | Contextual / minor contributor | Essential cofactor for tyrosine hydroxylase, the rate-limiting enzyme in the conversion of tyrosine to dopamine; critical for catecholamine synthesis | |
| Neurotransmitter Regulation | Magnesium | Contextual / minor contributor | Broad cofactor for neurotransmitter synthesis and receptor modulation (e.g., NMDA, GABA); functions as an NMDA receptor antagonist and GABA receptor modulator; assists enzymes involved in synthesis of dopamine and serotonin | |
| Neurotransmitter Regulation | Phenylalanine | Contextual / minor contributor | Essential amino acid that converts to tyrosine and supports catecholamine synthesis (dopamine, norepinephrine); participates in LAT1 competition at the blood-brain barrier | |
| Neurotransmitter Regulation | Potassium | Contextual / minor contributor | Critical for membrane potential, nerve signaling, and neuronal excitability; adequate intake balances sodium effects | |
| Neurotransmitter Regulation | Propionate | Contextual / minor contributor | Stimulates secretion of norepinephrine and may influence dopamine regulation; promotes synthesis of key neurotransmitters | |
| Neurotransmitter Regulation | Tryptophan | Contextual / minor contributor | Precursor for serotonin and melatonin; brain entry competes at LAT1 with other large neutral amino acids (LNAAs); carbohydrate-rich, low-protein meals raise the plasma tryptophan:LNAA ratio because insulin pushes competing LNAAs out to muscles; can feed NAD+ synthesis via the kynurenine pathway | |
| Neurotransmitter Regulation | Tyrosine | Contextual / minor contributor | Catecholamine precursor (dopamine, norepinephrine); brain transport via LAT1 competes with other LNAAs; iron is an essential cofactor for tyrosine hydroxylase, the rate-limiting enzyme in conversion of tyrosine to dopamine; cofactors include iron, B6, folate, omega-3s, and BH₄ (tetrahydrobiopterin) to support rate-limiting steps in catecholamine synthesis | |
| Neurotransmitter Regulation | Vitamin B6 (Pyridoxine → PLP) | Contextual / minor contributor | Cofactor for synthesis of dopamine, serotonin, GABA, and glutamate; supports rate-limiting steps in catecholamine synthesis; requires PDXK activation with magnesium and ATP support | |
| Neurotransmitter Regulation | Vitamin B9 (Folate; 5-MTHF) | Contextual / minor contributor | Supports neurotransmitter synthesis through methylation; cofactor for dopamine synthesis alongside iron, B6, and omega-3s | |
| Neurotransmitter Regulation | Zinc | Contextual / minor contributor | Important for DNA synthesis, cell division, and neurotransmitter regulation, particularly in modulating dopamine—a key neurotransmitter implicated in ADHD; acts as an allosteric modulator of the GABA receptor; supports glutamate regulation |
References
- Lentils listed as plant protein source (DIAAS 65-70), methionine/cysteine-limited; pair with grains for complete amino acid profile
- Lentils mentioned as source of fiber, folate, iron for neurotransmitter synthesis
- Part of grain-legume complementarity strategy; grains (typically lysine-limited) and legumes (methionine/cysteine-limited) complete each other's profiles when paired
- Source of prebiotic fiber (GOS - galactooligosaccharides) supporting gut microbiome health
- Glutamate: Principal excitatory neurotransmitter; food sources include lentils, poultry, fish, spinach, pumpkin seeds; cofactors include glutamine (from protein), B6, magnesium, zinc
- Zinc: Neurotransmitter modulation, synaptic plasticity, antioxidant enzymes; food sources include oysters, beef, crab, chicken, pork, pumpkin seeds, lentils, chickpeas, cashews
- Soaking and sprouting reduces phytates in legumes/grains, improving non-heme iron and zinc bioavailability GREINER and KONIETZNY 1999
- Vitamin C significantly improves non-heme iron absorption by reducing ferric to ferrous iron, with studies showing up to a fourfold increase when consumed together Hallberg et al. 1989