Phaseolus vulgaris

FRESH GREEN BEANS (vegetable): Harvest young, immature pods (approx. 10–15 cm, seeds still small and soft) and ALWAYS cook for a minimum of 10 minutes in plenty of rapidly boiling water — never eat raw. Discard the cooking water, which contains leached lectins and oligosaccharides. Use as a side dish, in salads (after cooling), soups, stews or bean puree. Blanched and frozen, the produce keeps 10–12 months.

DRIED BEANS (pulse): Soak dried beans for at least 8–12 hours in plenty of cold water; discard soaking water. Then boil vigorously in fresh water for at least 45–60 minutes (strong boiling is essential to fully denature phytohaemagglutinin — do NOT use a slow cooker for dried kidney beans). Discard the cooking water (leached lectins and oligosaccharides). Use cooked beans in soups, stews, salads (after cooling), hummus-style dips or bean paste. Tinned/canned beans are already cooked — drain and rinse before use.

BEAN HULL TEA (Phaseoli pericarpium): Pour 250 ml boiling water over 3–5 g dried, chopped bean hulls (outer pods without seeds — use only from ripe dried beans; green pods are less suitable), cover, steep 15 minutes, strain. 2 cups daily for a maximum of 4 weeks. Folk medicinal use as a mild aquaretic (diuretic) for mild urinary tract infections and flushing of the urinary tract — adjunctive only, no substitute for medical treatment. Important: drink plenty of fluid (at least 2 litres of water daily) during use. Fever, severe pain or blood in urine: see doctor immediately.

Dry amount

3–5 g

Doses per day

2×

Max duration

4 weeks

PLANT PROTEIN SOURCE / DIABETIC DIET: Cooked beans (tinned or home-cooked) have a low glycaemic index (GI approx. 20–40 depending on variety) and high satiety effect. A protein source in vegetarian and vegan diets (beans + cereal = complete amino acid profile). Studies show: regular legume consumption (at least 3–4 × weekly 80 g cooked beans) lowers LDL cholesterol and improves glycaemic control. Not for self-treatment of diabetes — dietary therapy under medical/dietetic supervision.

KITCHEN — TRADITIONAL PREPARATIONS: Cooked beans (white, red, black, borlotti) in classic dishes: stews (minestrone, chilli con/sin carne), bean salad with vinegar and oil (only from cooled, fully cooked beans), bean puree (hummus-style), bean bread (cooked beans as flour substitute up to 30 %), fermented soy-sauce analogues (traditional in Latin America). Savory (Satureja hortensis/montana) is the traditional kitchen companion — reputed to reduce flatulence and aid digestion, effect empirical. Always: never raw or merely lukewarm. Slow cookers (< 100 °C) may fail to inactivate lectins sufficiently — insist on vigorous boiling.

FOLATE / IRON / POTASSIUM — MICRONUTRIENT USE: 100 g cooked white beans provide approx. 130 µg folate (≈ 65 % of EU daily requirement), 3.7 mg iron (≈ 26 % DV) and 561 mg potassium (≈ 28 % DV). Particularly relevant in pregnancy (increased folate demand) and vegetarian/vegan diets (iron supply). Combining with vitamin-C-rich vegetables (peppers, tomatoes) enhances non-haem iron absorption. Not a substitute for supplementation in clinically confirmed deficiency.

DIETARY FIBRE / RESISTANT STARCH: Cooked beans contain 6–8 g dietary fibre per 100 g (soluble + insoluble) and resistant starch (especially high after cooling). Both fractions act as prebiotics, promote gut microbiome diversity and increase stool frequency. Slowly digestible carbohydrates buffer blood glucose rise. Note: dietary fibre and non-absorbable oligosaccharides (raffinose, stachyose) can cause bloating and flatulence — gradual increase in consumption amount is recommended.