Kale
Overview
Kale is a nutrient-dense leafy green providing iron, magnesium, zinc, quercetin, and carotenoids. The BRAIN diet specifically targets leafy green vegetables i.e. kale and spinach that are rich in iron, magnesium, and zinc, though this can introduce high dietary oxalate. Boiling kale can reduce oxalate load, improving mineral bioavailability. Kale is abundant in quercetin, a flavonoid polyphenol with antioxidant and anti-inflammatory properties.
Recipes
1 recipe containing this food
Savoury Greens & Egg Breakfast Skillet
A warm savoury breakfast skillet with eggs, greens, and slow carbohydrates for steady morning energy.
Substances
17 substances in this food
Calcium
Bone health; neurotransmission; interacts with vitamin D and K2
Copper
Cofactor in redox enzymes; dopamine β-hydroxylase; iron metabolism interplay
Iron
Oxygen transport; dopamine synthesis (tyrosine hydroxylase cofactor)
Lutein
Neuroprotective carotenoid; accumulates in neural tissues and retina; supports cognitive performance
Magnesium
Enzymatic cofactor (>300 reactions); neurotransmitters; mitochondria; redox balance
Manganese
Cofactor for MnSOD (SOD2); mitochondrial antioxidant defense
Potassium
Electrolyte for nerve transmission, muscle function, and blood pressure regulation
Quercetin (and Isoquercetin)
Polyphenol; antioxidant; mitochondrial support; bioavailability improved with vitamin C
Vitamin A (Retinoids; β-Carotene precursor)
Neurodevelopment; immune regulation; antioxidant via carotenoids
Vitamin B1 (Thiamine)
Mitochondrial glucose metabolism; ATP synthesis; rapid turnover in CNS
Vitamin B2 (Riboflavin)
FMN/FAD coenzymes; redox balance; supports methylation via MTHFR
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
Vitamin C (Ascorbate)
Antioxidant; supports iron absorption; neuronal SVCT2 transport
Vitamin K2 (MK forms)
Calcium handling; potential roles in brain health; often co-occurs with fat-soluble vitamins
Zeaxanthin
Neuroprotective carotenoid; accumulates in neural tissues and retina; supports cognitive performance
Zinc
Cofactor in neurotransmission and antioxidant enzymes; dopamine modulation
Preparation Notes
- Boiling reduces oxalates and improves mineral bioavailability Chai and Liebman 2005
- Pair with fat (avocado, olive oil) for carotenoid absorption; co-consuming a small amount of unsaturated fat improves micelle formation and chylomicron packaging
- Pair with vitamin C sources to enhance iron absorption, with studies showing up to a fourfold increase when consumed together Hallberg et al. 1989
- Part of diverse leafy green strategy
- Practical pairings: carrots + tahini, kale + avocado, berries + yogurt/nuts
Biological Target Matrix
| Biological Target | Substance | Contribution Level | Therapeutic Areas | Mechanism of Action |
|---|---|---|---|---|
| Hormonal Response | Calcium | Contextual / minor contributor | Supports calcium modulation along with vitamin D, magnesium, taurine, phospholipids, and flavonoids; supports insulin sensitivity, sympathetic arousal, and mitochondrial excitability | |
| Hormonal Response | Magnesium | Contextual / minor contributor | Supports calcium modulation along with vitamin D, taurine, phospholipids, and flavonoids; supports insulin sensitivity, sympathetic arousal, and mitochondrial excitability | |
| Hormonal Response | Quercetin (and Isoquercetin) | Contextual / minor contributor | Flavonoid support for calcium modulation and insulin sensitivity | |
| Hormonal Response | Vitamin C (Ascorbate) | Contextual / minor contributor | Supports norepinephrine synthesis as cofactor | |
| Hormonal Response | Vitamin K2 (MK forms) | Contextual / minor contributor | Modulates calcium distribution; supports calcium handling and may support neural function; occurs in fermented foods and certain animal products | |
| Inflammation | Copper | Contextual / minor contributor | Participates in redox enzymes and antioxidant networks | |
| Inflammation | Lutein | Contextual / minor contributor | Anti-inflammatory properties; supports immune regulation | |
| Inflammation | Quercetin (and Isoquercetin) | Contextual / minor contributor | Anti-inflammatory, anti-neuroinflammatory, and neuroprotective properties; supports gut barrier integrity and TLR4 suppression | |
| Inflammation | Vitamin C (Ascorbate) | Contextual / minor contributor | Antioxidant properties; supports anti-inflammatory effects | |
| Inflammation | Zeaxanthin | Contextual / minor contributor | Anti-inflammatory properties; supports immune regulation | |
| Inflammation | Zinc | Contextual / minor contributor | Supports immune signaling; gut barrier integrity disrupted by nutrient deficiencies including zinc | |
| Inflammation | β-Carotene | Contextual / minor contributor | Anti-inflammatory properties; supports immune regulation | |
| Insulin Response | Magnesium | Contextual / minor contributor | Supports insulin sensitivity and glucose metabolism; magnesium deficiency is associated with insulin resistance; supports enzymes involved in glucose metabolism | |
| Insulin Response | Vitamin B1 (Thiamine) | Contextual / minor contributor | Supports glucose metabolism and insulin sensitivity through mitochondrial function | |
| Methylation | Vitamin B2 (Riboflavin) | Contextual / minor contributor | FAD acts as a critical cofactor for MTHFR, linking riboflavin to homocysteine recycling and methylation capacity | |
| Methylation | 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 | 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 | 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 Support | Iron | Contextual / minor contributor | Critical for oxygen delivery to the brain via hemoglobin; supports mitochondrial function and energy production | |
| Mitochondrial Support | 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 Support | Manganese | Contextual / minor contributor | Supports mitochondrial antioxidant defense through MnSOD activity | |
| Mitochondrial Support | Quercetin (and Isoquercetin) | Contextual / minor contributor | Enhances mitochondrial baseline activity and energy production; supports mitochondrial function | |
| Mitochondrial Support | 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 | |
| Mitochondrial Support | Vitamin B2 (Riboflavin) | Contextual / minor contributor | Forms FMN/FAD coenzymes, supporting oxidative metabolism and redox balance; facilitates metabolism of B12, B6, and niacin; supports antioxidant enzymes | |
| Neurochemical Balance | Calcium | Contextual / minor contributor | Essential for nerve impulse transmission and neurotransmission | |
| Neurochemical Balance | Copper | Contextual / minor contributor | Cofactor in dopamine β-hydroxylase, supporting catecholamine synthesis; supports norepinephrine synthesis | |
| Neurochemical Balance | Iron | Contextual / minor contributor | Essential cofactor for tyrosine hydroxylase, the rate-limiting enzyme in the conversion of tyrosine to dopamine; critical for catecholamine synthesis | |
| Neurochemical Balance | 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 | |
| Neurochemical Balance | Potassium | Contextual / minor contributor | Critical for membrane potential, nerve signaling, and neuronal excitability; adequate intake balances sodium effects | |
| Neurochemical Balance | 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 | |
| Neurochemical Balance | Vitamin B9 (Folate; 5-MTHF) | Contextual / minor contributor | Supports neurotransmitter synthesis through methylation; cofactor for dopamine synthesis alongside iron, B6, and omega-3s | |
| Neurochemical Balance | Vitamin C (Ascorbate) | Contextual / minor contributor | Supports norepinephrine synthesis; transported in brain via SVCT2 | |
| Neurochemical Balance | 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 | |
| Oxidative Stress | Copper | Contextual / minor contributor | Included in antioxidant enzyme networks; interacts with iron metabolism affecting oxidative stress | |
| Oxidative Stress | Lutein | Contextual / minor contributor | Antioxidant properties; scavenges reactive oxygen species and stabilizes cell membranes | |
| Oxidative Stress | Manganese | Contextual / minor contributor | Essential cofactor for MnSOD (SOD2), supporting detoxification of superoxide within the mitochondrial matrix | |
| Oxidative Stress | Quercetin (and Isoquercetin) | Contextual / minor contributor | Effective antioxidant agent that scavenges reactive oxygen species; supports antioxidant defenses | |
| Oxidative Stress | Vitamin A (Retinoids; β-Carotene precursor) | Contextual / minor contributor | Provitamin A carotenoids (β-carotene) act as antioxidants in neural tissue; contribute to antioxidant network | |
| Oxidative Stress | Vitamin C (Ascorbate) | Contextual / minor contributor | Key water-soluble antioxidant; works within antioxidant network with vitamin E, CoQ10, and polyphenols | |
| Oxidative Stress | Zeaxanthin | Contextual / minor contributor | Antioxidant properties; scavenges reactive oxygen species and stabilizes cell membranes | |
| Oxidative Stress | Zinc | Contextual / minor contributor | Essential mineral that serves as a cofactor for antioxidant enzymes; works synergistically with other antioxidants; heavy metals are detoxified by metallothionein (MT) metal carrier proteins that must bind with zinc and copper | |
| Oxidative Stress | β-Carotene | Contextual / minor contributor | Antioxidant properties; scavenges reactive oxygen species and stabilizes cell membranes | |
| Stress Response | Magnesium | Contextual / minor contributor | Helps manage stress responses; combined with vitamin D reduced behavioral problems; synergy with zinc and omega-3s reported | |
| Stress Response | Quercetin (and Isoquercetin) | Contextual / minor contributor | Contributes to LPS and immune defense; supports stress response modulation | |
| Stress Response | Vitamin C (Ascorbate) | Contextual / minor contributor | Supports stress response through antioxidant and neurochemical effects |
References
- The BRAIN diet specifically targets leafy green vegetables i.e. kale and spinach that are rich in iron, magnesium, and zinc
- Boiling spinach, kale, and other greens can reduce oxalate load, improving mineral bioavailability Chai and Liebman 2005
- Quercetin is abundant in capers, apples, onions, berries, kale and soybeans
- Practical pairings: carrots + tahini, kale + avocado, berries + yogurt/nuts
- Oxalate binds to minerals and forms insoluble compounds, significantly reducing bioavailability; boiling helps mitigate this
- 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