Wheatena: a whole wheat porridge judged on wheat evidence

Nobody has studied Wheatena itself. We found no trial, survey entry or regulatory record under the brand name, so everything on this page is about whole wheat hot cereal and wheat bran as a class. The firmest result is a letdown for wheat. A network meta-analysis of 55 trials in 3,900 people found wheat and wheat bran did not improve blood lipids, while oat bran lowered LDL cholesterol by 12 mg/dL (95% CI -17 to -7.3; metric: 0.32 mmol/L, -0.44 to -0.19), and those comparisons were indirect with mixed doses. Across randomized trials in adults, whole wheat wheat foods did not significantly lower the blood sugar rise after a meal compared with white wheat (-121 mg/dL (-6.7 mmol/L) x min, 95% CI -25.1 to 11.7). Those trials used mostly bread, and porridge was never analyzed on its own. A cup of cooked whole wheat cereal (240 g) gives about 113 calories, 3.1 g fiber and 1.1 mg iron in US survey data, from the generic entry rather than the brand.

How much is actually in it

• A cup of cooked whole wheat hot cereal (240 g) carries about 113 calories, 3.1 g fiber and 1.1 mg iron in US survey data. — US household measures, FNDDS (n = 1 food code) Evidence E source
  Per 100 g cooked: energy 47 calories, fiber 1.3 g, iron 0.44 mg; per cup 240 g: 112.8 calories, 3.1 g fiber, 1.1 mg iron

What your body absorbs

• In human studies, low-phytate white bread raised serum iron 2 hours after eating about twice as much as high-phytate whole wheat bread (59 vs 30 micrograms per 3.4 fl oz (100 mL)), but longer trials did not improve iron stores. — Healthy or iron-deficient participants in 8 human intervention studies, 1970 to 2024 Evidence B source
  2 h serum iron 59 vs 30 ug/100 mL (low- vs high-phytate bread); phytase +50% iron absorption from ferrous sulfate

What cooking and storage change

• By the USDA table for cooked breakfast cereals, cooking keeps about 70% of folate, 80% of thiamin and 95% of iron, while zinc, calcium and magnesium stay at 100%. — Breakfast cereals group, regular or quick, cooked (USDA Retention Factors) Evidence E source
  Retained: folate 70%, thiamin 80%, riboflavin 90%, niacin 90%, iron 95%, zinc 100%

What it does to your health

• Across randomized trials, whole wheat wheat foods did not significantly lower the blood sugar rise after a meal compared with white wheat (-121 mg/dL (-6.7 mmol/L) x min, not significant), unlike intact brown rice. — Adults in randomized trials comparing whole-grain and refined wheat, rice or rye, searched to November 2017 Evidence A source
  Whole wheat vs white wheat glucose AUC -121 mg/dL (-6.7 mmol/L) x min (95% CI -25.1 to 11.7), P = 0.477
• Cohort data link each 3 daily servings of whole grains with a 32% lower risk of type 2 diabetes, with inverse associations also seen for whole grain cereals and wheat bran, based on few studies. — Adults in 16 prospective cohort studies Evidence C source
  RR 0.68 (95% CI 0.58 to 0.81) per 3 servings/day of whole grains; refined grains RR 0.95 (0.88 to 1.04)
• A review of 40 studies in 1,308 healthy adults found intact cereal fiber raised gut microbiota diversity or abundance in 39 of 42 comparisons, with as little as 6 to 8 g extra wheat fiber enough. — Healthy adults in cereal fiber interventions lasting 1 day to 1 year (26 crossover RCTs, 11 parallel RCTs, 3 non-randomized) (n = 1308) Evidence A source
  39 of 42 studies showed increased microbiota diversity and/or abundance; 6-8 g wheat fiber sufficient

What people believe that the data does not support

• A network meta-analysis of 55 trials with 3,900 people found wheat and wheat bran did not improve blood lipids, while oat bran lowered LDL cholesterol by 12 mg/dL (0.32 mmol/L). — Participants in 55 trials of whole grains and brans (n = 3900) Evidence A source
  Wheat and wheat bran: no significant lipid change; oat bran LDL-C -12 mg/dL (95% CI -17 to -7.3; metric: -0.32 mmol/L, -0.44 to -0.19)
• In a meta-analysis of randomized trials with 205 adults, cereal fibers raised gut short-chain fatty acids, but wheat bran fiber on its own did not. — Adults aged 20 to 69 in trials of cereal fiber lasting at least 2 weeks (n = 205) Evidence A source
  Total SCFA SMD 0.96 (95% CI 0.54 to 1.39) for cereal fibers overall; wheat bran fiber not significant
• The EU authorizes the claim that wheat bran fiber contributes to faster intestinal transit, a claim about the bran fiber rather than whole wheat cereal as such. — EU health claim assessment, claim POL-HC-6528 Evidence E source
  Authorized

Who this works differently for

• Pooled stable-isotope data from 236 children aged 8 to 50 months showed dietary phytate barely changed zinc absorption: 500 mg more phytate a day cut absorbed zinc by under 0.04 mg. — Children aged 8 to 50 months in stable-isotope zinc absorption studies (n = 236) Evidence C source
  Phytate effect not significant (P = 0.29); +500 mg/day phytate reduced absorbed zinc by <0.04 mg/day

The bottom line

The case for whole grains rests on association. Cohort data from 16 prospective studies link each 3 daily servings of whole grains with a 32% lower risk of type 2 diabetes (RR 0.68, 95% CI 0.58 to 0.81), with high heterogeneity between studies. Whole grain cereals and wheat bran showed the same direction, but only a few studies looked at them. A review of 40 studies in 1,308 healthy adults found intact cereal fiber raised gut microbiota diversity or abundance in 39 of 42 comparisons, and 6 to 8 g of extra wheat fiber was enough. The studies were not pooled, three were not randomized, and a shift in gut bacteria is a surrogate measure. In a meta-analysis of trials with 205 adults, cereal fibers as a group raised short-chain fatty acids in stool, while wheat bran fiber on its own did not reach significance. Whole wheat carries phytate, and the iron story is mixed. In short human studies, low-phytate white bread raised serum iron 2 hours after eating about twice as much as high-phytate whole wheat bread (59 vs 30 micrograms per 3.4 fl oz (100 mL)), yet longer trials did not improve iron stores. Five of the six parallel studies had a high risk of bias, and all of it was bread. For zinc in young children the effect looks tiny. Pooled stable-isotope data from 236 children aged 8 to 50 months showed that 500 mg more phytate a day cut absorbed zinc by under 0.04 mg, which was not statistically significant (P = 0.29). That is modeling of pooled data, and it says nothing about adults. Cooking keeps about 95% of the iron, 70% of the folate and all the zinc by the USDA retention table for cooked breakfast cereals, a 1975 group factor never measured on Wheatena. We have no safety evidence for this cereal at all. Wheat allergy and celiac disease were outside what we researched, so this page cannot tell you anything about them. We also found no study on whether toasting the wheat, which is what sets this cereal apart, changes its phytate or anything else.

Sources

1. wtna-r2-01 · reference dataset
   FNDDS 2708442 Whole wheat cereal, cooked: Energy 47 kcal/100 g, 1 cup cooked 240 g 112.8 kcal · Fiber 1.3 g/100 g, 1 cup 3.1 g · Iron 0.44 mg/100 g, 1 cup 1.1 mg
   USDA FNDDS 2021-2023 · checked 2026-09-29
2. wtna-r2-08 · Systematic review
   Results were inconclusive as acute postprandial studies increased non-haem iron bioavailability (especially in low-phytate breads); 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. However, long-term trials did not improve, and in one case even decreased, ferritin and total body iron
   Front Nutr, 2026 · checked 2026-09-29
3. wtna-r2-02 · USDA Table of Nutrient Retention Factors, dataset
   USDA-RETN-R6:358 CEREAL,REG/QUICK,COOKED, group Breakfast Cereals: folate_total_ug 70% retained, thiamin_mg 80%, riboflavin_mg 90%, niacin_mg 90%, iron_mg 95%, zinc_mg 100%, calcium_mg 100%, magnesium_mg 100%
   USDA Table of Nutrient Retention Factors, Release 6, 2007, Retn_Code 358 · checked 2026-09-29
4. wtna-r2-03 · Meta-analysis of RCTs
   The consumption of ground (wholemeal) wheat, compared with white wheat, was not associated with a significant reduction in blood glucose AUC (-6.7 mmol/L ⋅ min; 95% CI: -25.1, 11.7 mmol/L ⋅ min; P = 0.477).
   Am J Clin Nutr, 2018 · checked 2026-09-29
5. wtna-r2-05 · Meta-analysis of cohorts
   The summary relative risk per 3 servings per day was 0.68 (95% CI 0.58-0.81, I(2) = 82%, n = 10) for whole grains and 0.95 (95% CI 0.88-1.04, I(2) = 53%, n = 6) for refined grains... Inverse associations were observed for subtypes of whole grains including whole grain bread, whole grain cereals, wheat bran and brown rice, but these results were based on few studies
   Eur J Epidemiol, 2013 · checked 2026-09-29
6. wtna-r2-09 · Systematic review
   Thirty-nine of the forty-two studies demonstrated an increase in microbiota diversity and/or abundance following intact cereal fiber consumption, with effects apparent from 24 h to 52 weeks. Increases in wheat fiber as low as 6-8 g were sufficient to generate significant effects.
   Front Nutr, 2019 · checked 2026-09-29
7. wtna-r2-04 · Network meta-analysis
   Fifty-five eligible trials with a total of 3900 participants were included... Barley, brown rice, wheat and wheat bran were shown to be ineffective in improving blood lipid compared with control.
   Eur J Nutr, 2019 · checked 2026-09-29
8. wtna-r2-06 · Meta-analysis of RCTs
   Of the 555 identified studies, 14 intervention groups involving 205 participants aged between 20 and 69 years are eligible... Furthermore, we found that cereal fibers and wheat/rye arabinoxylan oligosaccharides, rather than wheat bran fibers, barley fibers, and barley β-glucan, could significantly elevate the SCFA concentration.
   Food Funct, 2021 · checked 2026-09-29
9. wtna-r2-10 · Regulatory register
   POL-HC-6528 Wheat bran fibre Wheat bran fibre contributes to an acceleration of intestinal transit Authorised
   EU Register on nutrition and health claims, claim POL-HC-6528, snapshot 2026-09-21 · checked 2026-09-29
10. wtna-r2-07 · Pooled analysis
    Data from 236 children between 8 and 50 mo of age were obtained from stable-isotope studies of zinc absorption... The effect of dietary phytate on zinc absorption when controlling for dietary zinc was very small and not statistically discernable (P = 0.29). A 500-mg/d increase in dietary phytate reduced absorbed zinc by <0.04 mg/d.
    J Nutr, 2015 · checked 2026-09-29