Red Lentil (boiled)
Serving sizes
Red Lentil (boiled) changes rating with portion size. These are the amounts tested in the literature behind our ratings.
- ½ cup (92.5g)
- ⅝ cup (109g)
Red lentils are Moderate FODMAP at a small serving, thanks to their GOS content, and they tip into high territory as the bowl grows.
- The main driver here is GOS (galacto-oligosaccharides), a group of carbohydrates naturally found in legumes. At ½ cup (92.5g) the GOS load sits at a moderate level, so it is manageable for many people in a modest portion.
- As the serving grows past that point, the GOS adds up and the overall level climbs into high territory, so this is a food where keeping an eye on scoop size really pays off.
Boiling and draining canned or well-rinsed lentils can help wash away some of the water-soluble GOS, so a smaller serving stirred through a dish is often a comfortable way to enjoy them.
Per ½ cup (92.5g): 0.43g GOS.
Why red lentil (boiled) is rated moderate
Red lentils are split and skinless, which is why they collapse into a puree instead of holding their shape, and that texture is exactly what makes their rating awkward. GOS is the subgroup behind it: ½ cup (92.5g) is moderate and ⅝ cup (109g) is high. Once the lentils have melted into a dahl or a thick soup, nothing on the plate signals which of those two rungs the bowl is sitting on. Moderate is a portion to keep an eye on, not a food to serve by the ladle, and with red lentils the measuring has to happen before the pot turns everything into one smooth thing.
What changes your risk
- The portion vanishes into the puree ½ cup (92.5g) is moderate, ⅝ cup (109g) is high, and a soup bowl hides the difference completely. Work out the servings before the lentils go soft, or measure the finished dish into equal portions and know how many the pot was built to make.
- The cooking method works against the water trick GOS is water-soluble, so boiling in plenty of water and tipping it away removes some of it. Red lentils are almost always simmered until the liquid is absorbed, so nothing gets poured off and it all stays in the bowl. Long cooking does not break GOS down, however soft the lentils get.
- The canned form runs lower Canned lentils drained and rinsed under cold running water carry a lower record than lentils boiled from dried. Rinse in a sieve until the cloudiness stops, and use the record that matches the form on the plate.
- Stacking GOS across the tray Dahl rarely arrives alone. Add a chickpea side, a bean salad, or cashews scattered over the top, and several GOS foods land in one meal, which takes the total well past what the lentil serving alone suggests.
- The curry paste and the stock Jarred curry pastes, stock cubes and soup bases usually carry onion and garlic, and those ride along regardless of how the lentils are measured. Garlic-infused oil with ginger, cumin, turmeric, mustard seed and chives builds the same depth without them.
Swaps
Red lentils earn their place by thickening things, so the useful swaps are the ones that also thicken. Potato cooked soft and mashed into a soup gives body, polenta does the same job in a different register, and carrot or zucchini simmered down adds substance to a curry sauce. Quinoa or rice carries a curry instead of dissolving into it, and firm tofu brings the protein a dahl was providing. Reaching for chickpeas or split peas does not help, since GOS is the same subgroup driving the rating here. If the lentil flavour is what is wanted, canned lentils drained and rinsed are the lower running form of the same food.
How to lower the load
Decide the number of servings before you cook rather than after: measure the lentils into the pot, note how many ½ cup (92.5g) portions that represents once cooked, and divide the finished dish by that number. Dish up with a measured cup rather than a ladle, and freeze leftovers in single portions so tomorrow's bowl is already decided. Build the base on garlic-infused oil and whole spices instead of a jarred paste, since a paste puts onion and garlic in every spoonful. A restaurant dahl is an unmeasured amount on an onion and garlic base, which is a very different proposition from a pot portioned at home.
Common questions
how much red lentils can i have on low fodmap
½ cup (92.5g) is moderate and ⅝ cup (109g) is high. No lower serving is tested, so ½ cup (92.5g) is the amount to measure to, not a free pass.
are red lentils high in gos
GOS is the subgroup behind their rating. At ½ cup (92.5g) it puts them at moderate, and by ⅝ cup (109g) it puts them at high.
is red lentil pasta low fodmap
This record covers boiled red lentils only, not red lentil pasta, which is a different product made from a different amount of lentil. Use the record for the food actually being eaten rather than carrying this serving across.
does rinsing red lentils remove fodmaps
Rinsing dried lentils before cooking does very little on its own. GOS is water-soluble, so it leaches out when legumes sit in liquid, which is why canned lentils drained and rinsed run lower than lentils boiled from dried and simmered until the liquid is absorbed.
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Informational only, not medical advice. Individual tolerance varies. Talk to a healthcare professional or a dietitian for personal guidance.
References
- Fructan and free fructose content of common Australian vegetables and fruit. Muir et al. (2007), J. Agricultural and Food Chemistry 55(16):6619-6627.
- Measurement of short-chain carbohydrates in common Australian vegetables and fruits by HPLC. Muir et al. (2009), J. Agricultural and Food Chemistry 57(2):554-565.
- Quantification of fructans, galacto-oligosaccharides and other short-chain carbohydrates in processed grains and cereals. Biesiekierski et al. (2011), J. Human Nutrition and Dietetics 24(2):154-176.
- Dietary sorbitol and mannitol: food content and distinct absorption patterns. Yao et al. (2014), J. Human Nutrition and Dietetics 27(Suppl 2):263-275.
- FODMAPs: food composition, defining cutoff values and international application. Varney et al. (2017), J. Gastroenterology and Hepatology 32(Suppl 1):53-61. Supplies the low, moderate and high cutoffs used on this page.
Last reviewed September 22, 2026.