Oatmeal bread: the oat name without a known oat dose

Oat beta-glucan lowers LDL cholesterol. Across 58 randomized trials with 3974 people, a median 3.5 g a day lowered it by 0.19 mmol/L (95% CI 0.14 to 0.23), with high variation between trials and many different foods carrying the fiber. We found no figure for how much beta-glucan a slice of oatmeal bread holds, in USDA tables or in the studies. Whether an ordinary loaf reaches a useful dose is unknown. Bread built to carry the dose gave split results. In 46 people with type 2 diabetes and high LDL, an enriched bread giving 3 g beta-glucan a day for 3 weeks lowered LDL by 26 mg/dL (0.66 mmol/L) against 4.3 mg/dL (0.11 mmol/L) in the control group. In a 16-week trial of 194 adults at risk of type 2 diabetes, at least 3 slices a day of bread giving 6 g beta-glucan made no significant difference to HbA1c compared with whole-grain wheat bread (-0.01%, 95% CI -0.03 to 0.06).

The numbers, per 3.5 oz (100 g)

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

How much is actually in it

• A regular 0.99 oz (28 g) slice of oatmeal bread gives about 75 calories, 2.4 g protein, 1.1 g fiber and 125 mg sodium. — US oatmeal bread, survey recipe Evidence E source
  Per 100 g: 269 calories, 8.4 g protein, 4 g fiber, 447 mg sodium
• Oatmeal bread is mostly starch with some added sugar: 48.5 g carbohydrate and 8.1 g total sugars per 3.5 oz (100 g), with 0.7 g saturated fat and 2.7 mg iron. — US oatmeal bread, survey recipe Evidence E source
  Carbohydrate 48.5 g, total sugars 8.14 g, saturated fat 0.703 g, iron 2.7 mg per 3.5 oz (100 g)

What a real portion looks like

• Toasting dries the slice rather than adding calories: per 3.5 oz (100 g) toasted oatmeal bread has 296 calories versus 269, but a regular slice still gives about 74 to 75 calories. — US oatmeal bread, untoasted versus toasted Evidence E source
  296 vs 269 calories/100 g; regular slice 25 g toasted 74.0 calories vs 28 g untoasted 75.3 calories

What your body absorbs

• A review of 8 human studies found bread fermentation and lower phytate raised short-term iron uptake, for example a 2-hour serum iron rise of 59 versus 30 ug per 3.4 fl oz (100 mL) with low- versus high-phytate bread. — 8 human intervention studies in healthy or iron-deficient people Evidence C source
  2 h serum iron rise 59 vs 30 ug Fe/100 mL (low- vs high-phytate bread)

What it does to your health

• Across 58 RCTs with 3974 people, a median 3.5 g a day of oat beta-glucan lowered LDL cholesterol by 7.3 mg/dL (0.19 mmol/L). — 3974 participants in 58 RCTs of at least 3 weeks (n = 3974) Evidence A source
  LDL-C -7.3 mg/dL (95% CI -8.9 to -5.4; metric: -0.19 mmol/L, -0.23 to -0.14)
• A meta-analysis of 28 blinded RCTs with 1494 adults found that isolated beta-glucan lowered LDL cholesterol in parallel-arm studies, with a standardized effect of -0.58. — 1494 adults in 28 blinded RCTs of at least 2 weeks (n = 1494) Evidence A source
  Isolated beta-glucan LDL SMD -0.58 (95% CI -0.85 to -0.32); total cholesterol SMD -0.73; triglycerides SMD -0.30

Safety, limits and interactions

• In the same trial, 7 people dropped out of the oat beta-glucan bread group and 2 of the control group because of adverse events such as stomach problems, with no serious adverse events. — Adults at risk of type 2 diabetes in a 16-week bread trial (n = 202) Evidence B source
  Dropouts due to adverse events: 7 oat vs 2 control; no serious adverse events

What people believe that the data does not support

• The EU authorizes saying that oat beta-glucan lowers blood cholesterol, but an oatmeal bread can carry it only if it delivers the required beta-glucan dose, which a typical recipe is not shown to do. — EU health claim register Evidence E source
  Status: Authorized
• The EU also authorizes saying that beta-glucans from oats or barley eaten with a meal reduce the blood glucose rise after it. — EU health claim register Evidence E source
  Status: Authorized

Who this works differently for

• In a 16-week double-blind RCT of 194 adults at risk of type 2 diabetes, at least 3 slices a day of oat beta-glucan bread (6 g beta-glucan) did not change HbA1c versus whole-grain wheat bread. — 194 adults aged 58 on average, BMI 32, Germany, Norway, Sweden, 16 weeks (n = 194) Evidence B source
  HbA1c difference -0.01% (95% CI -0.03 to 0.06)
• In 46 people with type 2 diabetes, bread enriched to give 3 g beta-glucan a day for 3 weeks lowered LDL cholesterol by 26 mg/dL (0.66 mmol/L) versus 4.3 mg/dL (0.11 mmol/L) in the control group. — 46 patients with type 2 diabetes and LDL-C above 130 mg/dL (3.37 mmol/L), 3 weeks (n = 46) Evidence B source
  LDL-C -26 mg/dL (-0.66 mmol/L) (15.79%) vs -4.3 mg/dL (-0.11 mmol/L) (2.71%), P=0.009

The bottom line

As bread, a regular 0.99 oz (28 g) slice gives about 75 calories, 2.4 g protein, 1.1 g fiber and 125 mg sodium. Per 100 g it has 48.5 g carbohydrate with 8.1 g total sugars, 0.7 g saturated fat and 2.7 mg iron, and the share of oats in that recipe is unknown. Toasting dries the slice. Toasted oatmeal bread has 296 calories per 3.5 oz (100 g) against 269, and a toasted 0.88 oz (25 g) slice still comes to about 74 calories. On iron, a review of 8 human studies found that bread fermentation and lower phytate raised short-term iron uptake. Low-phytate white bread, for example, raised serum iron over 2 hours by 59 against 30 micrograms per 3.4 fl oz (100 mL) for high-phytate whole wheat bread. Most of those studies carried a high risk of bias, and none was about oats. The EU authorizes two oat claims. One says oat beta-glucan lowers blood cholesterol, the other that beta-glucans from oats or barley eaten with a meal reduce the blood glucose rise after it. Both come with dose conditions, and a typical oatmeal bread has not been shown to meet them. The only safety data come from the 16-week trial. Seven people left the beta-glucan bread group and two left the control group because of adverse events such as stomach problems, and no serious adverse events were reported. We have no card on allergy, celiac disease, children, pregnancy or medicines for this bread.

Sources

1. otbr-daily-r4-01 · food composition dataset
   FNDDS 2707768 Bread, oatmeal: Energy 269 kcal/100 g, 1 medium or regular slice 28 g 75.3 kcal · Protein 8.4 g/100 g, slice 2.4 g · Fiber, total dietary 4 g/100 g, slice 1.1 g · Sodium 447 mg/100 g, slice 125.2 mg
   USDA FNDDS 2021-2023, Bread, oatmeal (FDC 2707768) · checked 2026-10-01
2. otbr-daily-r4-02 · food composition dataset
   FNDDS 2707768 Bread, oatmeal: Carbohydrate, by difference 48.5 g/100 g · Total Sugars 8.14 g/100 g · Fatty acids, total saturated 0.703 g/100 g · Iron, Fe 2.7 mg/100 g
   USDA FNDDS 2021-2023, Bread, oatmeal (FDC 2707768) · checked 2026-10-01
3. otbr-daily-r4-03 · food composition dataset
   FNDDS 2707769 Bread, oatmeal, toasted: Energy 296 kcal/100 g, 1 medium or regular slice 25 g 74.0 kcal; FNDDS 2707768 Bread, oatmeal: Energy 269 kcal/100 g, 1 medium or regular slice 28 g 75.3 kcal
   USDA FNDDS 2021-2023, Bread, oatmeal (FDC 2707768) and Bread, oatmeal, toasted (FDC 2707769) · checked 2026-10-01
4. otbr-daily-r4-09 · systematic review
   for example, low-phytate white bread produced a greater 2 h increase in serum iron than high-phytate wholemeal bread (59 vs. 30 μg Fe/100 mL), while exogenous phytase increased iron absorption by 50% for ferrous sulfate and 61% for iron bis-glycine chelate.
   Front Nutr, 2026 · checked 2026-10-01
5. otbr-daily-r4-07 · meta-analysis of RCTs
   In total, fifty-eight trials (n 3974) were included. A median dose of 3·5 g/d of oat β-glucan significantly lowered LDL-cholesterol (-0·19; 95 % CI -0·23, -0·14 mmol/l, P<0·00001)
   Br J Nutr, 2016 · checked 2026-10-01
6. otbr-daily-r4-08 · meta-analysis of RCTs
   Moreover, isolated β-glucan interventions from parallel-arm studies decreased TC (-0.73, 95%CI: -1.01;-0.45, p < 0.00001), LDL (-0.58, 95%CI: -0.85;-0.32, p < 0.0001) and triglycerides (-0.30, 95%CI: -0.49;-0.12, p = 0.001).
   Clin Nutr ESPEN, 2023 · checked 2026-10-01
7. otbr-daily-r4-05 · randomized controlled trial
   Seven individuals in the oat group and 2 individuals in the control group dropped out because of adverse events such as stomach problems. No serious adverse events were reported.
   Am J Clin Nutr, 2025 · checked 2026-10-01
8. otbr-daily-r4-10 · EU claim register entry
   POL-HC-6248 Oat beta-glucan Oat beta-glucan has been shown to lower/reduce blood cholesterol. High cholesterol is a risk factor in the development of coronary heart disease -/- Authorised
   EU Register on nutrition and health claims, claim POL-HC-6248, snapshot 2026-09-21 · checked 2026-10-01
9. otbr-daily-r4-11 · EU claim register entry
   POL-HC-6331 Beta-glucans from oats and barley Consumption of beta-glucans from oats or barley as part of a meal contributes to the reduction of the blood glucose rise after that meal Authorised
   EU Register on nutrition and health claims, claim POL-HC-6331, snapshot 2026-09-21 · checked 2026-10-01
10. otbr-daily-r4-04 · randomized controlled trial
    Participants consumed ≥3 slices/d of either β-glucan-enriched bread (6 g β-glucan/d) or control bread, 6 d/wk. RESULTS: After 16 wk, there was no significant between-group difference in HbA1c [Δ = -0.01%, 95% confidence interval (CI): -0.03, 0.06; P = 0.49].
    Am J Clin Nutr, 2025 · checked 2026-10-01
11. otbr-daily-r4-06 · randomized controlled trial
    The consumption of bread containing betaglucan led to significant reductions (vs the control group) in LDL-C of 0.66 mmol/l (15.79%) versus 0.11 mmol/l (2.71%) (P=0.009)
    Diabetes Metab, 2009 · checked 2026-10-01