Biscuits: mostly a vehicle for whatever the baker added

Research on biscuits is mostly research on what somebody put inside one. Of 49 randomised trials of vitamin D-fortified foods, five used bread or savoury biscuits as the carrier, and when each vehicle was meta-analysed on its own the weighted mean differences in 25-hydroxyvitamin D ran from about 9 to 35 nmol/L across the vehicles, with no separate figure for biscuits. The biscuit itself turns up in trials as the thing being taken away. When 136 non-obese adults who habitually snacked swapped their daily biscuit for 42.5 g of almonds for a full year, body weight went from 66.3 to 66.3 kg on biscuits and from 67.1 to 69.5 kg on almonds, P = 0.275. The biscuit there is the comparator and not the treatment, so that year bounds what a daily biscuit does to weight without measuring it. An enriched biscuit is also not a lower-energy biscuit. Three research recipes measured once in one laboratory came to 1874.9 kJ per 100 g for the branched-chain-amino-acid-enriched biscuit, 1893.3 for the arginine-enriched one and 1873.6 for the control.

The numbers, per 100 g

How much is actually in it

• Enriching a research biscuit with amino acids left its energy untouched, 1874.9 and 1893.3 against 1873.6 kJ per 100 g for the control, so an enriched biscuit is not a lower-energy biscuit. — three laboratory-made biscuit formulations analysed for macronutrients, no human participants (n = 3 formulations) Evidence D source
  1874.9, 1893.3 and 1873.6 kJ per 100 g for the BCAA-enriched, arginine-enriched and control biscuits

What a real portion looks like

• Pooling 10 surveys of 67 093 Iranian children aged 4 to 12 put biscuits and cakes at 3.33 servings a day, third behind sweets at 8.01 and oils at 5.58. — 67 093 Iranian children aged 4 to 12 across 10 studies (n = 67093) Evidence C source
  Biscuits and cakes 3.33 servings per day, sugars and sweets 8.01, oils 5.58

What your body absorbs

• Eating kiwifruit 30 minutes before a wheaten biscuit cut the glycaemic response by 20 to 30% in 20 adults and almost halved the peak, while the same fruit eaten with the biscuit did less. — 20 adults in a randomised crossover trial, single meals (n = 20) Evidence B source
  Glycaemic iAUC lower by 20-30%; response amplitude down almost 50% when the fruit came 30 min earlier
• Replacing 20% of the wheat flour in biscuits with okara did not change postprandial amino acid absorption in 15 middle-aged and older adults (P = 0.568). — 15 middle-aged and older Singaporean adults, three 2-hour meal tolerance tests with 100 g of biscuits (n = 15) Evidence B source
  Total amino acid iAUC 23649 (13738 to 33560) control against 23284 (13374 to 33195) biovalorised and 17257 (7346 to 27168) autoclaved okara, P = 0.568

What cooking and storage change

• A meta-analysis of 28 articles covering 549 data points found that baking lowers deoxynivalenol and zearalenone in biscuits, while milling and fermentation raise deoxynivalenol and total aflatoxin in cereal products. — 549 data points from 28 articles on cereal-based product processing, 1983 to June 2017 (n = 28 articles, 549 data points) Evidence D source
  Direction only: cooking lowers DON and ZEN in biscuits; milling and fermentation raise DON and total aflatoxin

What it does to your health

• Replacing a daily biscuit snack with 42.5 g of almonds for a whole year left body weight unchanged in 136 habitual snackers (P = 0.275). — 136 non-obese adults who habitually snacked on discretionary foods, 12 months (n = 136) Evidence B source
  Body weight 66.3 to 66.3 kg on biscuits against 67.1 to 69.5 kg on almonds, P = 0.275 (no significant difference)
• Five of 49 randomised trials of vitamin D-fortified foods used bread or savoury biscuits as the carrier, and meta-analysis of each vehicle on its own gave weighted mean differences in 25-hydroxyvitamin D of about 9 to 35 nmol/L across the vehicles. — 49 randomised trials of vitamin D-fortified food vehicles, 5 of them using bread or savoury biscuits (n = 49 trials) Evidence A source
  Weighted mean difference in 25(OH)D about 9 to 35 nmol/L when each food vehicle is meta-analysed separately (3 to 15 RCT arms per vehicle), all significant except UV-mushrooms (P = 0.06)
• Eating 90 g a day of biscuits with 30% of the wheat flour replaced by fermented brewer's spent grain raised HDL cholesterol over 12 weeks in the 10 adults given that version (P = 0.024). — 31 metabolically impaired Singapore adults, 11 control, 10 autoclaved and 10 fermented brewer's spent grain, 12 weeks (n = 31) Evidence B source
  HDL-C increased in the fermented arm, P = 0.024; faecal lithocholic acid fell, P interaction = 0.02
• Swapping a conventional wheat biscuit for a plant-protein-enriched one inside a 12-week calorie-restricted diet gave 5.31% against 4.24% weight loss in 30 women, a gap that was not significant. — 30 premenopausal women with overweight or obesity, BMI 29.8 plus or minus 3.53, 12 weeks of energy restriction (n = 30) Evidence B source
  Weight loss 5.31% on the enriched biscuit against 4.24% on the control, not statistically significant

Safety, limits and interactions

• Acrylamide measured in 80 biscuits sold in Spain averaged 343 micrograms per kg, with individual products running from under 20 to 2144 micrograms per kg. — 80 commercial biscuits on sale in Spain, laboratory measurement, no human participants (n = 80 products) Evidence D source
  Mean 343 μg/kg, range from under 20 to 2144 μg/kg across the 80 products
• The EU acrylamide figure for biscuits and wafers, 350 micrograms per kg, is a benchmark level used to judge whether bakers' mitigation measures work, and not a safety limit a product is allowed to sit under. — food business operators in the EU making biscuits, wafers and crackers Evidence E source
  Benchmark level 350 µg/kg for biscuits and wafers, 400 µg/kg for crackers other than potato-based, Annex IV

What people believe that the data does not support

• Across 125 studies, plant sterols carried in bread, biscuits and cereals lowered LDL cholesterol 0.14 mmol/L less than the same sterols carried in spreads, so the carrier food changes the result. — 125 studies of phytosterol-fortified foods pooled by food format (n = 125 studies) Evidence A source
  Overall LDL-C minus 0.55 mmol/L; bread, biscuits and cereals format 0.14 mmol/L (95% CI -8.71 to -2.16) smaller decrease than butter, margarine and spreads

Who this works differently for

• A double-blind crossover challenge with 1.5 g a day of soya lecithin baked into a biscuit produced a reaction in 1 of 20 soya-allergic children, against 5 reactions on placebo. — 22 children aged 8 months to 5 years with confirmed non-IgE-mediated gastrointestinal soya allergy, 20 completed (n = 22 recruited, 20 completed) Evidence B source
  Reactions in 1 case (5%) on 1.5 g/day soya lecithin against 5 cases (23%) on placebo
• After the same protein-enriched biscuit, 15 women and men with overweight or obesity showed lower postprandial rises of alanine, glutamine and threonine than 15 normal-weight people (p < 0.05). — 30 adults, 15 normal weight and 15 with overweight or obesity, acute randomised crossover, 180 min sampling (n = 30) Evidence B source
  IAUC of alanine, glutamine and threonine significantly lower in the overweight group, p < 0.05

What is still unknown

• Pooling 28 studies of wheat-based foods put acrylamide highest among processing contaminants at 136.29 micrograms per kg, and found no commercial-sample data at all for some regions of the world. — 28 studies of wheat-based foods including cookies, bread and pasta, drawn from 1479 records (n = 28 studies) Evidence D source
  Acrylamide 136.29 µg/kg, hydroxymethylfurfural 70.59 µg/kg, polycyclic aromatic hydrocarbons 0.11 µg/kg

The bottom line

Two trials asked whether a better biscuit helps, and neither answered yes. Inside a 12-week calorie-restricted diet, 30 premenopausal women with overweight or obesity lost 5.31% of body weight on a plant-protein-enriched biscuit against 4.24% on the conventional one, 15 women per arm, a gap that was not statistically significant. Biscuits with 30% of the wheat flour replaced by fermented brewer’s spent grain, 90 g a day for 12 weeks, raised HDL cholesterol in the 10 metabolically impaired Singapore adults who got that version, P = 0.024. That one stays open for a plain reason: ten people per arm, many outcomes measured, and nobody has repeated it. The timing trick has firmer ground than the recipe. In 20 adults, kiwifruit eaten 30 minutes before a wheaten biscuit cut the glycaemic response by 20 to 30% and almost halved the peak, while the same fruit eaten alongside the biscuit did less. That was single meals with one biscuit type, so it shows the effect of the order and not what the habit is worth over a year. Replacing 20% of the wheat flour with okara changed nothing measurable about amino acid absorption in 15 middle-aged and older Singaporean adults given 100 g of biscuits, P = 0.568. That is an absence of a detectable difference in 15 people rather than proof of none. For how much gets eaten, the only figure here is recall from 67 093 Iranian children aged 4 to 12, where biscuits and cakes came to 3.33 servings a day, third behind sweets at 8.01 and oils at 5.58. That category merges biscuits with cakes. Acrylamide is the contaminant worth knowing about. Across 28 studies of wheat-based foods it pooled at 136.29 micrograms per kg, higher than any other processing contaminant measured, and whole regions of the world have no retail measurements at all. Those are measurements of products and not of people, so they say what is in the food rather than what it does in a body. In 80 biscuits on sale in Spain the mean was 343 micrograms per kg and individual products ran from under 20 to 2144, a hundredfold spread on the same shelf. Those are Spanish market samples, so the absolute numbers travel badly. The EU figure for biscuits and wafers, 350 micrograms per kg, is a benchmark level, a performance indicator for checking whether the mitigation measures of bakers work, and not a safety limit a product is allowed to sit under. Baking itself lowers deoxynivalenol and zearalenone in biscuits, by direction rather than by any pooled percentage, in a meta-analysis of 28 articles covering 549 data points from laboratory and industrial batches. On allergy the news is calm. In a randomised double-blind crossover challenge, 1.5 g a day of soya lecithin baked into a biscuit produced a reaction in 1 of 20 children with confirmed non-IgE-mediated gastrointestinal soya allergy, against 5 reactions on placebo. Each arm lasted one week, with the parents reporting the symptoms. That supports keeping soya lecithin in the diet of such a child without ruling out an individual reactor. One more difference between people: after the same purpose-built protein-enriched biscuit, 15 adults with overweight or obesity showed lower postprandial rises of alanine, glutamine and threonine than 15 normal-weight adults, p < 0.05, on a single meal in 30 people.

Sources

1. bscs-daily-r1-12 · laboratory composition analysis
   The energy contents of the three biscuits were 1874.9, 1893.3 and 1873.6 kJ/100 g for BCAAsB, ArgB and CB, respectively.
   Eur J Nutr, 2025 · checked 2026-09-24
2. bscs-daily-r1-08 · pooled cross-sectional surveys
   Ten studies with 67 093 children were included in this review. The meta-analysis demonstrated that the highest consumption of processed foods belonged to the sugars and sweets group with 8.01 S/D, followed by oils, and biscuits and cakes with 5.58 S/D and 3.33 S/D, respectively.
   East Mediterr Health J, 2021 · checked 2026-09-24
3. bscs-daily-r1-02 · randomised crossover trial
   In all exchanges, KF reduced the glycaemic response (iAUC) by 20-30% with no loss of total satiation...Glycaemic response amplitudes were reduced almost 50% compared with 74 g WB when KF ingestion preceded WB ingestion by 30 min
   Nutrients, 2023 · checked 2026-09-24
4. bscs-daily-r1-03 · randomised crossover trial
   Amino acid iAUC had no significant difference, as demonstrated with total amino acids iAUC (μmol/L·min) (P = 0.568, C: 23649 [13738, 33560], RO: 23284 [13374, 33195] & AOK: 17257 [7346, 27168]).
   Eur J Clin Nutr, 2026 · checked 2026-09-24
5. bscs-daily-r1-05 · meta-analysis
   A total of twenty and eight articles (549 data) collected from 1983 through June 2017 were included...Cooking reduces the concentration of DON and ZEN in the biscuit.
   Food Chem, 2018 · checked 2026-09-24
6. bscs-daily-r1-01 · randomised controlled trial
   The difference in changes for body weight from baseline to 12 mo was not statistically significant (geometric means: 67.1 and 69.5 kg for almonds and 66.3 and 66.3 kg for biscuits, P = 0.275).
   Am J Clin Nutr, 2023 · checked 2026-09-24
7. bscs-daily-r1-09 · meta-analysis of RCTs
   The searches identified 49 papers which described suitable RCTs using vitamin D-fortified bread/savoury biscuits (n = 5), orange juice (n = 5), UV-mushrooms (n = 8), cheese (n = 3), yogurt (n = 5), fluid milk (n = 13), powdered milk (n = 5), eggs (n = 2), edible oils (n = 4), or breakfast cereal (n = 1)...Random-effects meta-analyses of each food vehicle individually indicated weighted mean differences (WMD) in 25(OH)D in the range ∼9-35 nmol/L (3-15 RCT arms, depending on vehicle), and all statistically significant (P < 0.01-0.0001), with the exception of UV-mushrooms (P = 0.06).
   J Steroid Biochem Mol Biol, 2024 · checked 2026-09-24
8. bscs-daily-r1-10 · randomised controlled trial
   Thirty-one metabolically impaired subjects were randomized to consume 90 g/day of control biscuits (Control, n = 11), 30% wheat flour substituted autoclaved BSG- (ABSG, n = 10) or fermented BSG-containing biscuits (FBSG, n = 10) for 12 weeks...FBSG group showed significant increase of HDL-C after intervention (P = 0.024).
   Eur J Nutr, 2026 · checked 2026-09-24
9. bscs-daily-r1-13 · randomised controlled trial
   There was a trend towards greater weight loss in the group that consumed the PB compared to CB, despite not being significant (percentage of weight loss: 5.31 vs. 4.24%).
   Nutrients, 2024 · checked 2026-09-24
10. bscs-daily-r1-06 · laboratory product survey
    Acrylamide was determined by LC-ESI-MS/MS in 80 commercial biscuits marketed in Spain. The mean acrylamide content was 343 μg kg-1 (from <20 to 2144 μg kg-1).
    Food Funct, 2019 · checked 2026-09-24
11. bscs-daily-r1-15 · regulation
    ‘benchmark levels’ means performance indicators used to verify the effectiveness of the mitigation measures and are based on experience and occurrence for broad food categories
    Commission Regulation (EU) 2017/2158, Article 3(2) and Annex IV, 2017 · checked 2026-09-24
12. bscs-daily-r1-04 · meta-analysis of trials
    The food format "Bread, biscuits, cereals", conditioned a lower decrease of 0.14 mmol/L (95%CI -8.71 to -2.16) in LDL-C levels, compared to the predominant food format group of "butter, margarine, spreads".
    Nutr Metab Cardiovasc Dis, 2023 · checked 2026-09-24
13. bscs-daily-r1-07 · randomised crossover challenge
    Children were randomly assigned to either placebo or challenge dose of soya lecithin (1.5 g per day) in a custom-made biscuit...the parents reported reactions in six cases: five cases (23%) to the placebo and one case (5%) to the challenge dose.
    J Hum Nutr Diet, 2020 · checked 2026-09-24
14. bscs-daily-r1-11 · randomised crossover trial
    Postprandial responses of all the determined AAs to enriched biscuits were higher in the NW compared to the OW group with incremental areas under the curve (iAUCs) of alanine, glutamine and threonine reaching statistical significance (p < 0.05).
    Eur J Nutr, 2025 · checked 2026-09-24
15. bscs-daily-r1-14 · meta-analysis
    Of the 1479 results, 28 were included for a meta-analysis...The highest concentration was for acrylamide (136.29 µg·kg-1) followed by HMF (70.59 µg·kg-1) and PAHs (0.11 µg·kg-1)...Acrylamide is the main processing contaminant researched, and no studies on the subject have been found in commercial samples in some regions of the world.
    Crit Rev Food Sci Nutr, 2023 · checked 2026-09-24