Edamame and sugar: 2.6 g per 3.5 oz (100 g), and none of it counts as free sugar

The firmest evidence filed under this pair tests fermented soy rather than green pods. A meta-analysis of 15 randomized trials in adults found that fermented soy, meaning natto, miso and tempeh and not edamame, lowered fasting plasma glucose by 6.39 mg/dL (95 percent CI -10.38 to -2.40) against controls. The same pooling put total cholesterol 5.0 mg/dL lower (95 percent CI -6.60 to -3.39) and body mass index 0.14 kg/m2 lower (95 percent CI -0.28 to -0.01). How long those trials ran the abstract does not say. Edamame itself is barely a sugar food. Boiled frozen edamame holds 2.6 g of total sugars per 3.5 oz (100 g), 1.3 g of it sucrose and 1.2 g maltose, in 6.5 g of carbohydrate, from one UK dataset entry with nothing independent to check the spread against. WHO counts as free sugars only what is added plus what sits in honey, syrups and juices, which leaves the sugars inside a vegetable such as edamame outside the under 10 percent of energy it recommends. Where edamame shows up in health data the data is thin. In 258 adults with or at risk of metabolic syndrome, higher edamame intake went with lower fasting plasma glucose in a cross-sectional analysis built on a food frequency questionnaire, with no effect size reported and association rather than cause.

How much is actually in it

• Boiled frozen edamame holds 2.6 g of total sugars per 3.5 oz (100 g), of which 1.3 g is sucrose, inside 6.5 g of total carbohydrate. — UK food composition dataset, boiled frozen edamame, per 3.5 oz (100 g) Evidence E source
  Total sugars 2.6 g/100 g, sucrose 1.3 g/100 g, maltose 1.2 g/100 g, fructose 0.1 g/100 g

What a real portion looks like

• In the USDA survey portion table one cup of cooked edamame weighs 5.6 oz (160 g) and a single pod yields 2 g of beans. — US survey food portions, cooked edamame, FNDDS food code 41420020 Evidence E source
  1 cup = 160 g, 1 pod yields 2 g, quantity not specified = 80 g

What your body absorbs

• Laboratory data suggest fermentation of soybean raises nutrient bioavailability, and the same review states that direct clinical evidence in people stays limited. — review of 59 peer-reviewed studies on fermented finger millet and soybean, mostly in vitro and small-scale (n = 59 studies) Evidence D source
  Direction only, no quantified change in bioavailability

What cooking and storage change

• By the USDA retention table for legumes boiled 15 to 20 minutes and drained, 60 percent of folate and 65 percent of vitamin C and thiamin stay in the food. — USDA retention factors, food group Legumes and Legume Products, method boiled 15 to 20 minutes and drained Evidence E source
  Folate 60 percent retained, vitamin C 65 percent, thiamin 65 percent, potassium 75 percent, iron 85 percent

What it does to your health

• In a meta-analysis of 14 randomized trials of 3 to 76 weeks, swapping sugar-sweetened drinks for artificially sweetened ones cut body weight by 1.6 lb (0.73 kg). — children, adolescents and adults in 14 randomized controlled trials, 3 to 76 weeks (n = 14 RCTs) Evidence A source
  Body weight -1.6 lb (-0.73 kg), body fat -0.72 percent, inconsistent glycemic effects
• A meta-analysis of 15 randomized trials found fermented soy lowered fasting plasma glucose by 6.39 mg/dL and total cholesterol by 5.0 mg/dL against controls. — adults in 15 randomized controlled trials of fermented soy products (n = 15 RCTs) Evidence A source
  Fasting plasma glucose -6.39 mg/dL (95% CI -10.38, -2.40), total cholesterol -5.0 mg/dL (95% CI -6.60, -3.39), BMI -0.14 kg/m2 (95% CI -0.28, -0.01)
• Prospective cohort data link each extra daily serving of sugar-sweetened beverage with 25 percent higher type 2 diabetes risk, while 20 g a day of total sugar or sucrose shows no higher risk. — 29 prospective cohorts of healthy adults, 541,288 participants for sugar-sweetened beverages (n = 29 cohorts) Evidence C source
  SSB RR 1.25 (95% CI 1.17, 1.35), fruit juice RR 1.05 (95% CI >1.00, 1.11), sucrose 20 g/d RR 0.95 (95% CI 0.91, <1.00), added sugar RR 0.99 (95% CI 0.96, 1.01)
• Cross-sectional data link higher edamame intake with lower fasting plasma glucose in adults with or at risk of metabolic syndrome. — 258 adults with or at risk of metabolic syndrome, cross-sectional arm (n = 258) Evidence C source
  Direction only, no effect size given for edamame in the abstract

Safety, limits and interactions

• By FDA rule, frequent between-meal eating of foods high in sugars and starches promotes tooth decay. — US labeling rule on noncariogenic carbohydrate sweeteners Evidence E source
  Regulatory wording, no effect size
• WHO advises keeping free sugars under 10 percent of total energy, and counts as free sugars only added sugars plus those in honey, syrups and juices, which leaves out sugars intrinsic to vegetables such as edamame. — WHO guideline for adults and children worldwide Evidence E source
  Less than 10 percent of total energy as a strong recommendation, below 5 percent as a conditional one
• A review of soybean protein applications names sensitization to soybean protein among the challenges that remain unresolved. — review of soybean protein based delivery systems, laboratory work Evidence D source
  No effect size, allergenicity named as an open challenge

What people believe that the data does not support

• The EU register lists the claim that isolated soy protein lowers blood cholesterol and so cuts heart disease risk as non-authorized. — EU register of nutrition and health claims, snapshot 2026-09-21 Evidence E source
  Status Non-authorized, zero authorized claims for soybean in the register
• The US health claim for soy protein and coronary heart disease exempts foods made of whole soybeans from the low fat requirement. — US labeling rule on soy protein and coronary heart disease Evidence E source
  Regulatory condition, no effect size

Who this works differently for

• Observational data link maternal sugar intake in pregnancy with higher intake of high-sugar products by the child up to adolescence, at low certainty. — 11 studies, 5 in humans and 6 in animals, offspring followed to adolescence (n = 11 studies) Evidence C source
  Direction only, no pooled estimate, GRADE low certainty across all studies

The bottom line

A cup of cooked edamame weighs 5.6 oz (160 g) in the USDA survey portion table and a single pod yields 2 g of beans. That table prints no sugar figure per portion, and the 2.6 g above is a per 3.5 oz (100 g) value from a separate UK dataset, so the two numbers are left side by side here rather than multiplied together. Boiling costs some of the water soluble vitamins. The USDA retention table for legumes boiled 15 to 20 minutes and drained keeps 60 percent of folate and 65 percent of vitamin C and thiamin, with potassium at 75 percent and iron at 85 percent. Those factors are set for the legume food group as a whole rather than for edamame, on a table dated 1975. We found no measurement in people of what the body takes up from edamame. Laboratory work suggests that fermenting soybean raises nutrient availability, and the review saying so, 59 studies that are mostly in vitro and small scale, states in the same place that direct clinical evidence in people stays limited. Two cautions are on the record. Soy protein sensitizes some people, and the laboratory review that raises it lists sensitization among the unresolved problems and gives no rate of reactions. The US labeling rule states that frequent between meal eating of foods high in sugars and starches promotes tooth decay, which is regulatory wording with no effect size behind it. On medicines, and on eating edamame in pregnancy, we found nothing. The closest evidence is a review of 11 studies, 5 in people and 6 in animals, linking maternal sugar intake in pregnancy with children eating more high sugar products up to adolescence, at low certainty and with no pooled estimate. Regulators disagree about soy. The EU register lists the claim that isolated soy protein lowers blood cholesterol and thereby cuts heart disease risk as non-authorized, which means the evidence fell short when it was assessed. The US rule that permits a soy protein and heart disease claim exempts foods made of whole soybeans from its low fat condition. On the sugar half of this pair the numbers that exist are about drinks. Across 29 prospective cohorts with 541,288 healthy adults, each extra daily serving of sugar sweetened beverage was associated with 25 percent higher type 2 diabetes risk (RR 1.25, 95 percent CI 1.17 to 1.35), and cohorts show association rather than cause. Swapping those drinks for artificially sweetened ones cut body weight by 1.6 lb (0.73 kg) across 14 randomized trials of 3 to 76 weeks in children, adolescents and adults, a drink against drink comparison whose abstract reports no confidence intervals and nothing about a plate of beans.

Sources

1. edsu-daily-r5-01 · food composition dataset
   Beans, edamame, frozen, boiled in unsalted water (CoFID 13-667): Total sugars (g) 2.6, Sucrose (g) 1.3, Maltose (g) 1.2, Fructose (g) 0.1, Carbohydrate (g) 6.5
   CoFID 2021, Public Health England, code 13-667 · checked 2026-09-25
2. edsu-daily-r5-02 · survey portion dataset
   Edamame, cooked (FNDDS 41420020, fdc_id 2707436): 1 cup 160 g, 1 pod yields 2 g, Quantity not specified 80 g
   USDA FNDDS, food code 41420020, fdc_id 2707436 · checked 2026-09-25
3. edsu-daily-r5-12 · narrative review
   Fermentation increases nutrient bioavailability, and enhances prebiotic activity (7, 30). ... Direct clinical evidence in human populations remains limited.
   Front Nutr, 2026 · checked 2026-09-25
4. edsu-daily-r5-03 · retention factor dataset
   LEGUMES,CKD 15/20MIN,BOILED,DRAINED (USDA-RETN-R6:501): folate_total_ug 60%, vitamin_c_mg 65%, thiamin_mg 65%, potassium_mg 75%, iron_mg 85%, zinc_mg 85%
   USDA Table of Nutrient Retention Factors, Release 6, 2007, Retn_Code 501 · checked 2026-09-25
5. edsu-daily-r5-04 · meta-analysis of RCTs
   In 14 RCTs (3-76 weeks), replacing SSBs with ASBs produced modest reductions in body weight (-0.73 kg) and body fat (-0.72%), with inconsistent effects on glycemic and cardiometabolic markers.
   Diabetes Metab J, 2026 · checked 2026-09-25
6. edsu-daily-r5-05 · meta-analysis of RCTs
   Results demonstrated significant beneficial effects of fermented soy on body mass index (WMD = -0.14 kg m-2, 95% CI: -0.28, -0.01, P = 0.039), waist circumference (WMD = -1.50 cm, 95% CI: -2.94, -0.07, P = 0.04), visceral fat (WMD = -692.17 mm2, 95% CI: -1011.58, -372.77, P < 0.001), fasting plasma glucose (WMD = -6.39 mg dL-1, 95% CI: -10.38, -2.40, P = 0.002), and total cholesterol (WMD = -5.0 mg dL-1, 95% CI: -6.60, -3.39, P < 0.001) compared with controls.
   Food Funct, 2025 · checked 2026-09-25
7. edsu-daily-r5-06 · meta-analysis of cohorts
   Each additional serving of SSB and fruit juice was associated with a higher risk of T2D (risk ratio [RR]: 1.25; 95% CI: 1.17, 1.35 and RR: 1.05; 95% CI: >1.00, 1.11, respectively; moderate certainty).
   Adv Nutr, 2025 · checked 2026-09-25
8. edsu-daily-r5-13 · cross-sectional
   Cross-sectionally, higher mung bean and edamame intakes are consistently associated with lower FPG, while ormosia, black bean, and soybean associated with lower INS and HOMA-IR.
   Mol Nutr Food Res, 2026 · checked 2026-09-25
9. edsu-daily-r5-08 · regulation
   Frequent between-meal consumption of foods high in sugars and starches promotes tooth decay.
   21 CFR 101.80, Health claims: dietary noncariogenic carbohydrate sweeteners and dental caries · checked 2026-09-25
10. edsu-daily-r5-11 · guideline
    In both adults and children, WHO recommends reducing the intake of free sugars to less than 10% of total energy intake2 (strong recommendation). ... Free sugars include monosaccharides and disaccharides added to foods and beverages by the manufacturer, cook or consumer, and sugars naturally present in honey, syrups, fruit juices and fruit juice concentrates.
    WHO Guideline: sugars intake for adults and children, 2015 · checked 2026-09-25
11. edsu-daily-r5-14 · systematic overview
    In addition, a number of challenges must be addressed, including the sensitization of soybean protein, intolerance to environmental conditions, and the limitations of processing technologies.
    Int J Biol Macromol, 2025 · checked 2026-09-25
12. edsu-daily-r5-09 · claim register
    POL-HC-6237 Isolated soy protein Protein-rich soybean component has been shown to lower/reduce blood cholesterol; blood cholesterol lowering may reduce the risk of (coronary) heart disease. -/- Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-6237, snapshot 2026-09-21 · checked 2026-09-25
13. edsu-daily-r5-10 · regulation
    The food shall meet the nutrient content requirement in § 101.62 for a “low fat” food, unless it consists of or is derived from whole soybeans and contains no fat in addition to the fat inherently present in the whole soybeans it contains or from which it is derived.
    21 CFR 101.82, Health claims: Soy protein and risk of coronary heart disease (CHD) · checked 2026-09-25
14. edsu-daily-r5-07 · systematic review
    In HS, maternal sugar intake was linked to the consumption of high-sugar products by infants up to adolescence.
    Matern Child Health J, 2026 · checked 2026-09-25