Skipping breakfast before exercise creates a more negative 24-hour energy balance: A randomized controlled trial in healthy physically active young men

Research output: Contribution to journalArticlepeer-review


  • Robert Edinburgh
  • Aaron Hengist
  • Harry Smith
  • Rebecca Travers
  • James Betts
  • Dylan Thompson
  • Jean-Philippe Walhin
  • David Hamilton
  • Emma Stevenson
  • Kevin Tipton
  • Javier Gonzalez

Colleges, School and Institutes

External organisations

  • University of Bath
  • Deakin Univ
  • Newcastle University
  • University of Stirling


Background: At rest, omission of breakfast lowers daily energy intake, but also lowers energy expenditure, attenuating any effect on energy balance. The effect of breakfast omission on energy balance when exercise is prescribed is unclear. Objectives: The aim of this study was to assess the effect on 24-h energy balance of omitting compared with consuming breakfast prior to exercise. Methods: Twelve healthy physically active young men (age 23 ± 3 y, body mass index 23.6 ± 2.0 kg/m 2) completed 3 trials in a randomized order (separated by >1 week): a breakfast of oats and milk (431 kcal; 65 g carbohydrate, 11 g fat, 19 g protein) followed by rest (BR); breakfast before exercise (BE; 60 min cycling at 50 % peak power output); and overnight fasting before exercise (FE). The 24-h energy intake was calculated based on the food consumed for breakfast, followed by an ad libitum lunch, snacks, and dinner. Indirect calorimetry with heart-rate accelerometry was used to measure substrate utilization and 24-h energy expenditure. A [6,6- 2H 2]glucose infusion was used to investigate tissue-specific carbohydrate utilization. Results: The 24-h energy balance was -400 kcal (normalized 95% CI: -230, -571 kcal) for the FE trial; this was significantly lower than both the BR trial (492 kcal; normalized 95% CI: 332, 652 kcal) and the BE trial (7 kcal; normalized 95% CI: -153, 177 kcal; both P < 0.01 compared with FE). Plasma glucose utilization in FE (mainly representing liver glucose utilization) was positively correlated with energy intake compensation at lunch (r = 0.62, P = 0.03), suggesting liver carbohydrate plays a role in postexercise energy-balance regulation. Conclusions: Neither exercise energy expenditure nor restricted energy intake via breakfast omission were completely compensated for postexercise. In healthy men, pre-exercise breakfast omission creates a more negative daily energy balance and could therefore be a useful strategy to induce a short-term energy deficit. This trial was registered at as NCT02258399.

Bibliographic note

Copyright © American Society for Nutrition 2019. Cite this as: Robert M Edinburgh, Aaron Hengist, Harry A Smith, Rebecca L Travers, James A Betts, Dylan Thompson, Jean-Philippe Walhin, Gareth A Wallis, D Lee Hamilton, Emma J Stevenson, Kevin D Tipton, Javier T Gonzalez, Skipping Breakfast Before Exercise Creates a More Negative 24-hour Energy Balance: A Randomized Controlled Trial in Healthy Physically Active Young Men, The Journal of Nutrition, , nxz018,


Original languageEnglish
Pages (from-to)1326-1334
Number of pages9
JournalJournal of Nutrition
Issue number8
Publication statusPublished - 10 Apr 2019


  • breakfast, carbohydrate; exercise, energy balance; fasting; metabolism; physical activity; substrate metabolism