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

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Version 2 2024-06-06, 01:34
Version 1 2019-08-02, 08:06
journal contribution
posted on 2024-06-06, 01:34 authored by RM Edinburgh, A Hengist, HA Smith, RL Travers, JA Betts, D Thompson, JP Walhin, GA Wallis, Lee HamiltonLee Hamilton, EJ Stevenson, KD Tipton, JT Gonzalez
ABSTRACT 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/m2) 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 [6,6-2H2]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 clinicaltrials.gov as NCT02258399.

History

Journal

Journal of Nutrition

Volume

149

Pagination

1326-1334

Location

United States

ISSN

0022-3166

eISSN

1541-6100

Language

English

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2019, American Society for Nutrition

Issue

8

Publisher

OXFORD UNIV PRESS