Black Beans
Overview
Black beans provide plant protein, polyphenols, and prebiotic fiber. The paper details optimal soaking conditions (60°C, pH 6.0) for phytate reduction. Optimal conditions for the endogenous phytases of black beans is 60°C and pH 6.0, that resulted in a 55% reduction in 1P6 after soaking and cooking. Black beans are polyphenol-rich and support gut health, similar to kidney beans.
Food Context
Synergies
- Pair with grains for complete amino acid profile; grain-legume complementarity improves essential amino-acid coverage
- Pair with vitamin C to enhance iron absorption, with studies showing up to a fourfold increase when consumed together Hallberg et al. 1989
- Soaking and sprouting reduces phytates in legumes/grains, improving non-heme iron and zinc bioavailability [GREINER and KONIET
Preparation
- Soak at 60°C (warm water) with pH 6.0 (lemon/vinegar) for optimal phytate reduction; optimal conditions for the endogenous phytases of black beans is 60°C and pH 6.0, that resulted in a 55% reduction in 1P6 after soaking and cooking
- Soak 12-24 hours, then cook thoroughly to reduce phytates and improve mineral bioavailability
Essential Amino Acid Profile
Black Beans provide a strong plant protein source but are not a complete protein.
Notable amino acids:
- Lysine
Limiting amino acids:
- Methionine and cysteine (DIAAS ~65–70)
Protein pairing strategy:
Black Beans are rich in lysine but relatively low in sulfur-containing amino acids. Combining with grains such as rice, oats, or barley helps create a more balanced essential amino acid profile.
Recipes
1 recipe containing this food
Black Bean & Sweet Potato Vegetable Chilli
A fibre-rich bean and vegetable chilli with warming spices and slow carbohydrates for steady energy and satiety.
Nutrient Tables (per 100 g)
Core nutrients
| Nutrient | Amount per 100 g | % RDA per 100 g |
|---|---|---|
| Energy | 85 kcal | — |
| Protein | 5.4 g | — |
| Total fat | 0 g | — |
| Saturated fat | 0 g | — |
| Carbohydrates | 15.4 g | — |
| Fibre | 3.8 g | — |
Key micronutrients
| Nutrient | Amount per 100 g | % RDA per 100 g |
|---|---|---|
| Iron | 1.1 mg | 6.2% |
| Calcium | 31 mg | 3.1% |
Substances
Substances in this food: editorial (Overview / literature) plus analytical (nutrition table).
19 substances in this food
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
Threonine
Essential AA; structural proteins; mucin production
Tryptophan
Serotonin/melatonin precursor; NAD+ pathway substrate; LAT1 transport dynamics
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
Calcium
Bone health; neurotransmission; interacts with vitamin D and K2
ZNY 1999](/docs/papers/BRAIN-Diet-References#greiner_phytate_1999)
References
- Optimal conditions for the endogenous phytases of black beans is 60°C and pH 6.0, that resulted in a 55% reduction in 1P6 after soaking and cooking
- Kidney beans: DIAAS 60-65, Methionine-limited; polyphenol-rich; supports gut health (black beans similar profile)
- Pair with whole grains or seeds for amino acid complementarity; grain-legume complementarity improves essential amino-acid coverage
- 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