Green Lentils

Food · Legume · Food, Typed Supps

Green lentils are a small, cheap plant food loaded with iron and folate that digests slowly, so it keeps you full without spiking your blood sugar.

Stage by stage

Chewing Begins (Mouth): Chewing the soft, cooked lentils exposes their starch granules to salivary amylase, kicking off carbohydrate digestion before the food reaches the stomach.
Acid Breakdown (Stomach): Stomach acid and pepsin begin breaking down lentil proteins while soluble fiber slows gastric emptying, producing the steady, sustained release of glucose behind their low glycemic profile.
Nutrient Absorption (Small Intestine): In the small intestine, amino acids, non-heme iron, and folate are absorbed across the intestinal wall, while resistant starch and much of the fiber travel on undigested to the colon.
Iron & Folate at Work (Blood & Bone Marrow): Absorbed iron travels via transferrin to the bone marrow to build haemoglobin, while folate supports the DNA synthesis needed to generate new red blood cells.

Timing

Pairing lentils with a vitamin C source, such as citrus, tomatoes, or peppers, in the same meal boosts absorption of their non-heme iron, while tea or coffee alongside them can blunt it.

Time to effect

Weeks: Fiber-driven fullness and a blunted blood sugar response happen within the same meal, but raising iron or folate status enough to register in bloodwork takes several weeks of consistent intake.

Allergens

None of the fourteen major allergens. Derived from what this food is, not from a product label.

Eating patterns

Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher, Gluten-free. Depends on the product: Low-FODMAP.

Satiety

225 on the satiety index, where white bread is 100 — very high. Modelled from the Holt et al. (1995) measurements.

Environmental footprint

1 kg CO2e and 397 litres of freshwater per kg, matched to "Peas" in Poore & Nemecek (2018), Science 360.

Cost band

Cheap — roughly £2.2 per kg, as a band midpoint rather than a price.

Key nutrients

Folate
Non-heme Iron
Dietary Fiber
Plant Protein
Potassium

Nutrition per 100g

Calories: 116
Protein: 9g
Carbohydrate: 20.1g
of which sugars: 1.8g
Fat: 0.4g
of which saturated: 0.1g
Fibre: 7.9g
Sodium: 2mg

Food vs. supplement

A cooked cup of lentils delivers about 358 mcg DFE of folate (90% DV) and 6.6 mg of non-heme iron (37% DV) alongside 15.6 g of fiber and 18 g of protein — a nutrient package bundled in a low-glycemic carbohydrate matrix that an isolated folic acid or iron pill can't replicate.

Kitchen tip

Rinse dried lentils and simmer for 15-20 minutes — no soaking required — and pair the dish with a vitamin-C-rich ingredient like tomatoes or citrus to boost iron absorption.

Common myth

"Lentils and other legumes need to be soaked overnight before cooking, just like dried beans." In reality: Lentils have thin seed coats and no soaking requirement — unsoaked lentils cook fully in 15-20 minutes; soaking only shortens that time and isn't necessary for safety, digestibility, or nutrition.