Sambar: what lentils do, and how much salt the pot holds

No trial has tested sambar itself, so the evidence here is about the pulses in it. A 2026 meta-analysis of 38 trials in 2095 adults found that whole pulses, a median 130 g a day for 6 weeks, lowered LDL cholesterol by 5.4 mg/dL (95% CI 3.1 to 7.3; metric: 0.14 mmol/L, 0.08 to 0.19). That is pulses in general, with moderate to high certainty. A cup of sambar, 248 g, gives about 10.7 g of protein, 9.9 g of fiber and 513 mg of sodium in the US dietary survey, from one recipe recalculated from 100 g. The UK table lists a homemade sambar at 444 mg of sodium per 3.5 oz (100 g), twice the US entry, and the two recipes differ in salt and in how much dal goes in. The salt in your own pot is set by the cook.

As people eat it, per 3.5 oz (100 g)

What a real portion looks like

• A cup of sambar (248 g) gives about 10.7 g of protein, 9.9 g of fiber and 513 mg of sodium in the US dietary survey database. — US household measures, FNDDS Evidence E source
  Per 100 g: protein 4.33 g, fiber 4 g, sodium 207 mg; per cup 248 g: 10.7 g, 9.9 g, 513.4 mg

What cooking and storage change

• For people who must limit potassium, soaking lentils before cooking gave the largest potassium reduction, while pressure cooking kept the most potassium. — lentils, beans and vegetables cooked by different techniques; sensory panel of 68 heart disease patients (n = 68) Evidence D source
  Soaking + cooking best reduction for lentils; pressure cooking lowest K losses; no significant ANOVA differences for legumes

What it does to your health

• A 2026 meta-analysis of 38 trials (2095 people) found that eating whole pulses, median 130 g a day for 6 weeks, lowered LDL cholesterol by 5.4 mg/dL (0.14 mmol/L). — adults in 38 randomized trials of at least 3 weeks, median dose 130 g/day (0.5-0.67 cup) (n = 2095) Evidence A source
  LDL-C MD -5.4 mg/dL (95% CI -7.3 to -3.1; metric: -0.14 mmol/L, -0.19 to -0.08); non-HDL-C -8.5 mg/dL (95% CI -12 to -5.4; metric: -0.22 mmol/L, -0.30 to -0.14)
• In a meta-analysis of 41 trials in people with and without diabetes, the 11 trials of pulses eaten on their own showed lower fasting blood glucose (SMD -0.82) and insulin (SMD -0.49). — people with and without diabetes in 41 controlled trials of at least 7 days (n = 41 trials) Evidence A source
  Pulses alone (11 trials): FBG SMD -0.82 (95% CI -1.36 to -0.27), insulin SMD -0.49 (95% CI -0.93 to -0.04); in low-GI diets HbA1c/fructosamine SMD -0.28
• In healthy adults, a soup where red lentils supplied 25 g of carbohydrate had a relative glycemic response of 49% of the potato-soup control. — healthy adults, randomized crossover, soup study n = 20 (n = 20) Evidence B source
  Relative glycemic response: soup 61% (green lentils), 49% (red lentils) vs control 100%
• A systematic review of 40 crossover trials found that meals with pulses gave lower blood glucose responses than wheat or rice controls in 28 of 40 studies. — 40 randomized crossover studies, mostly healthy adults, 120-420 minutes after the meal (n = 40 studies) Evidence A source
  Lower glucose in 28/40 and lower insulin in 16/24 studies vs starchy controls

What people believe that the data does not support

• The EU did not authorize a claim that low glycemic index foods such as legumes help maintain normal blood sugar, blood lipids and body mass. — — Evidence E source
  Status: non-authorized

Who this works differently for

• In a 24-week trial in Kerala of adults with type 2 diabetes, a low-GI diet built on local South Indian recipes reduced HbA1c and truncal fat compared with usual diet. — 40 adults aged 35-65 with type 2 diabetes in Kerala, 18 low-GI diet vs 18 usual diet, 24 weeks (n = 36) Evidence B source
  HbA1c and truncal fat significantly lower vs control (p < 0.05); sizes not in abstract

What is still unknown

• The UK food composition table lists homemade sambar at 49 calories, 3.1 g protein and 444 mg sodium per 3.5 oz (100 g), twice the sodium of the US entry. — UK composition table, homemade recipe Evidence E source
  Per 100 g: energy 49 calories, protein 3.1 g, AOAC fiber 2.4 g, sodium 444 mg, potassium 251 mg (vs FNDDS sodium 207 mg)

The bottom line

On blood sugar the pulse evidence is consistent and loosely measured. In a meta-analysis of 41 trials, the 11 trials of pulses eaten on their own lowered fasting blood glucose (standardized difference -0.82, 95% CI -1.36 to -0.27), with large unexplained differences between trials. A review of 40 crossover studies found pulse meals gave lower glucose than wheat or rice meals in 28 of them, by counting results rather than pooling them, and only over a few hours. In 20 healthy adults, a red lentil soup produced 49% of the glucose rise of a potato soup, over one meal, and that was lentil soup rather than sambar with rice. In Kerala, 36 adults with type 2 diabetes followed a low glycemic diet built on local South Indian recipes for 24 weeks, and their HbA1c fell more than on their usual diet. The abstract gives no size for that drop, and sambar was one dish among many. If you have been told to limit potassium, soaking lentils before cooking removed the most potassium in a food laboratory study, and pressure cooking kept the most. For legumes the differences between methods did not reach significance, and potassium was measured in the food, not in patients. The UK table lists homemade sambar at 251 mg of potassium per 3.5 oz (100 g). The EU did not authorize a claim that low glycemic foods such as legumes help keep blood sugar, blood fats and body weight normal. That means the evidence fell short at assessment. We have no card on sambar and allergy, medicines or pregnancy, so this page has no safety section.

Sources

1. smbr-daily-r5-01 · reference dataset
   FNDDS 2707430 Sambar, vegetable stew: Protein 4.33 g/100 g, 1 cup 248 g 10.7 g · Fiber 4 g/100 g, 1 cup 9.9 g · Sodium 207 mg/100 g, 1 cup 513.4 mg
   USDA FNDDS 2021-2023, Sambar, vegetable stew (fdc_id 2707430) · checked 2026-09-28
2. smbr-daily-r5-08 · food analysis
   For lentils, soaking-regardless of duration-combined with various cooking techniques yielded the best reductions. Pressure cooking resulted in the lowest K losses, followed by boiling in two waters and one water, respectively.
   Clin Nutr ESPEN, 2025 · checked 2026-09-28
3. smbr-daily-r5-03 · meta-analysis of RCTs
   Thirty-eight trials (52 trial comparisons, n=2095) with a median of 6 weeks and dose of 130 g/d (0.5-0.67 cup/d) showed that whole dietary pulses decreased low-density lipoprotein-cholesterol (mean difference, -0.14 mmol/L [95% CI, -0.19 to -0.08]), non-high-density lipoprotein-cholesterol (-0.22 mmol/L [95% CI, -0.30 to -0.14]), apoB (apolipoprotein B) (-0.08 g/L [95% CI, -0.13 to -0.03]) and high-density lipoprotein-cholesterol (-0.03 mmol/L [95% CI, -0.05 to -0.01]) with no effects on other lipids.
   J Am Heart Assoc, 2026 · checked 2026-09-28
4. smbr-daily-r5-04 · meta-analysis of RCTs
   Pulses alone (11 trials) lowered fasting blood glucose (FBG) (-0.82, 95% CI -1.36 to -0.27) and insulin (-0.49, 95% CI -0.93 to -0.04). Pulses in low-GI diets (19 trials) lowered glycosylated blood proteins (GP), measured as HbA(1c) or fructosamine (-0.28, 95% CI -0.42 to -0.14).
   Diabetologia, 2009 · checked 2026-09-28
5. smbr-daily-r5-05 · RCT, crossover, postprandial
   The RGR for muffins, chilies and soups was 88, 58 and 61%, respectively, for green lentils, and 84, 48 and 49%, respectively, for red lentils.
   Nutrients, 2024 · checked 2026-09-28
6. smbr-daily-r5-06 · systematic review
   Most of the articles in this review reported that non-oil-seed pulses cause lower glucose (28 of 40 studies) and insulin (16 of 24 studies) responses than other starchy foods in the control groups (mainly wheat-flour-based products or white rice).
   Nutr Rev, 2026 · checked 2026-09-28
7. smbr-daily-r5-09 · EU health claim register
   POL-HC-6868 Carbohydrate sources with low glycaemic index (GI <55), e.g. legumes, vegetables, whole grain cereals Consumption of low GI (low glycaemic index) foods with in the healthy diet (low glycaemic load - GL) can contribute to the maintenance of the normal blood sugar level, blood lipid level (triglyceride) and body mass. Non-authorised
   EU Register on nutrition and health claims, claim POL-HC-6868, snapshot 2026-09-21 · checked 2026-09-28
8. smbr-daily-r5-07 · RCT, parallel
   There was a significant reduction in glycated hemoglobin in the low GI diet group compared to the control group at p < 0.05.
   Nutrients, 2020 · checked 2026-09-28
9. smbr-daily-r5-02 · reference dataset
   CoFID 12-467 Sambar, homemade: Energy 49 kcal/100 g · Protein 3.1 g · AOAC fibre 2.4 g · Sodium 444 mg · Potassium 251 mg
   CoFID 2021, Public Health England / OGL v3.0, code 12-467 Sambar, homemade · checked 2026-09-28