Breakfast science
A good breakfast
builds a better day.
Explore the science of how a high-protein breakfast can support your daily nutrition & morning focus.
Meal response
It's the most important
meal of your day.
In a crossover trial, 22 adults with type 2 diabetes tested two meal schedules: breakfast eaten and breakfast skipped. Lunch and dinner stayed the same.
Skipping breakfast led to higher glucose exposure after both later meals. Insulin release was lower and delayed.[1]
Skipping can reduce insulin response to meals.
Relative glucose exposure
over three hours after each meal
After lunch
After dinner
higher after lunch on days breakfast was skipped.
higher after dinner on days breakfast was skipped.
Randomized crossover trial · 22 adults with type 2 diabetes
Jakubowicz et al., 2015
Individual responses may vary.
Dairy proteins
Not all protein is equal.
In a 12-week trial of 56 adults, higher-protein breakfasts produced lower overall glucose exposure after meals. The largest reduction was reported for a breakfast containing whey protein.[2]
Protein & the glucose curve.
In the trial, a high-protein breakfast containing whey reduced overall glucose exposure after meals.
Glucose response
Time after a meal
A separate study in 32 healthy young adults found that higher-protein milk with cereal reduced the morning glucose response compared with regular-protein milk.[3]
These findings apply to the meals and protein amounts studied.
Whey based high-protein breakfast reduced blood glucose.
Relative overall glucose exposure after meals
Randomized dietary trial · 56 adults with type 2 diabetes
Jakubowicz et al., 2017
View data & calculation
| Breakfast | Protein | Index |
|---|---|---|
| Carbohydrate-rich | 17 g protein | 100 |
| Higher-protein | 42 g protein from mixed sources | 88 |
| Higher-protein, including whey | 42 g total protein, including 28 g whey | 81 |
Index values use the abstract’s reported reductions: 100 − 12 = 88 and 100 − 19 = 81. Uncertainty for this derived index was unavailable in the abstract. Group sizes: 18, 19, and 19. Full-paper measurement timing remains under review.
Download data (CSV) ↓Breakfast in focus
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morning focus?
Thirty women aged 18–30 tried three conditions: a dairy-protein-and-oats breakfast, a lower-protein breakfast, and breakfast omission.
Improved concentration before lunch.
Test scores were 3.5 percentage points higher after the dairy-protein-and-oats breakfast than after skipping breakfast.
Study details · Dalgaard et al., 2024Bioavailability
Vitamins your
body can use.
Fortification means adding nutrients to food. A 12-week cereal trial analyzed results from 189 adults aged 50–85. Fortified cereal increased blood levels of folate, vitamin B6, and vitamin B12.[5]
A later trial in adolescent girls also found improvements in several nutrient measurements after regular fortified cereal with milk. Benefits occurred with morning and evening consumption.[6]
Blood nutrient levels measure nutritional status. Breakfast offers a familiar opportunity to make nutrient-rich food part of a daily routine.
A daily routine with
measurable benefits.
Plasma vitamin B12 · pmol/L
Fortified cereal296 → 354 pmol/L
Comparison cereal292 → 290 pmol/L
Randomized trial · 189 adults in the analysis
Tucker et al., 2004
Good nutrition
compounds.
Build your breakfast routine around good nutrition & a focused start to the day.
It’s never too late to start. Long-term research linked improvements in overall diet quality with a lower risk of death during follow-up.[7]
For us, good nutrition means making nutrient-rich food an enjoyable, repeatable part of your day.
What does the longer-term evidence show?
The cereal trials measured nutrient status. The long-term diet study followed associations between whole diets and later outcomes. Each answers a different research question.
The whole-diet study was observational. “Compounds” expresses the value of consistency as a brand idea.
Read the diet-quality study ↗Better mornings
start now.
Dairy protein, grains, nuts, seeds, fruit, and added vitamins and minerals, brought together in a breakfast worth repeating.
Look closer
at the evidence.
Open a study for its context and original source.
01Breakfast and later meals
Randomized crossover · 22 adults with type 2 diabetes. Breakfast omission increased three-hour glucose exposure after lunch by 36.8% and after dinner by 26.6%.
Participants habitually ate breakfast. Lunch and dinner were matched, and total daily energy differed. Assigned schedules were followed for two days before each test. The findings describe short-term responses in this group.
Funding review remains open in the source register. The paper reports an absence of relevant potential conflicts.
Jakubowicz et al. Diabetes Care. 2015;38:1820–1826. DOI: 10.2337/dc15-0761.
02Breakfast composition and glucose
12-week randomized dietary trial · 56 adults with type 2 diabetes. Overall glucose AUC was 12% lower for mixed-source higher-protein breakfast and 19% lower for the whey-containing breakfast, relative to the carbohydrate-rich condition.
The chart is derived from the abstract’s overall glucose-exposure comparison. The carbohydrate-rich condition is indexed to 100. Full-paper timing and methods review remains part of publication preparation. Whey was included in the 42 g protein total and was associated with greater insulin secretion.
Full-paper funding and conflict disclosures remain under review.
Jakubowicz et al. Journal of Nutritional Biochemistry. 2017;49:1–7. DOI: 10.1016/j.jnutbio.2017.07.005.
03Milk protein with breakfast cereal
Randomized controlled double-blind meal study · 32 healthy young adults. Higher-protein milk with cereal reduced pre-lunch glucose change and incremental AUC relative to normal-protein milk.
This study tested cereal with milk containing 3.1% or 9.3% protein and different casein-to-whey ratios. Its glucose outcome uses a separate measurement method; it is presented as supporting context.
Full-paper funding and conflict disclosures remain under review.
Kung et al. Journal of Dairy Science. 2018;101:8688–8701. DOI: 10.3168/jds.2018-14419.
04A pre-lunch concentration test
Randomized three-period crossover · 30 women aged 18–30 with overweight or obesity. PASAT concentration score at 150 minutes was 3.5 percentage points higher after the protein-rich meal than after breakfast omission (P=0.03).
Concentration was measured with a specific test 150 minutes after breakfast. The result applies to the controlled test and study population.
Support: Danish Dairy Research Foundation and Oda and Hans Svenningsens Foundation. Aarhus University supported open access. The final publication records an absence of author-stated conflict disclosures.
Dalgaard et al. Journal of Dairy Science. 2024;107:2653–2667. DOI: 10.3168/jds.2023-24152.
05Fortified cereal and vitamin B12
12-week randomized double-blind cereal trial · 189 adults aged 50–85 in these analyses. Plasma vitamin B12 increased in the fortified-cereal group.
The graph shows group means. Beginning averages weeks 0 and 2; ending averages weeks 12 and 14. Uncertainty is reported as the standard error of the mean (SEM). The outcome describes blood nutrient status.
Support: Kellogg Company and USDA Agricultural Research Service, contract 53-3K06-01. Author conflict-declaration review remains open.
Tucker et al. American Journal of Clinical Nutrition. 2004;79:805–811. DOI: 10.1093/ajcn/79.5.805.
06Fortification and daily routines
12-week randomized cereal-and-milk trial · Adolescent girls. Fortified cereal improved several nutrient-status markers; benefits occurred with morning and evening consumption.
The trial examined regular cereal-and-milk intake in adolescent girls. Improvements occurred with morning and evening consumption. Each nutrient was assessed separately.
Kellogg’s Company of Great Britain supplied cereal, research funding, and Marilyn H. Hill’s salary. The University of Sheffield paid Hilary J. Powers and Jean Russell. The paper reports independent study design, execution, writing, analysis, and interpretation, and an absence of competing interests.
Powers et al. Nutrition Journal. 2016;15:69. DOI: 10.1186/s12937-016-0185-6.
07Diet quality over time
Observational cohort analysis of whole-diet changes · 47,994 women and 25,745 men. Improved overall diet quality was associated with lower subsequent mortality.
The study followed 47,994 women and 25,745 men. Whole-diet changes were associated with later mortality. Its observational design allows residual confounding and supports an association.
Support: National Institutes of Health grants. Author disclosure forms remain part of the publication review.
Sotos-Prieto et al. New England Journal of Medicine. 2017;377:143–153. DOI: 10.1056/NEJMoa1613502.
This is not medical advice. Your healthcare team can offer guidance for your individual needs. Individual experiences may vary.