Effects of fasting or a vegetarian diet on subjective ratings of appetite and mood during strenuous physical activity

  • Stephan Rössner
  • Britta Hylander
  • Anna Hägg
  • Louise Dye
  • Claire Lawton
  • Neil King
  • John E Blundell

Abstract

Thirty-four subjects participating in "fasting marches" at a health spa were studied during three days of hiking 14-27 km daily and the combined effects of either fasting (n=10) or a hypocaloric lactovegetarian diet (n=20). Hunger, satiety, tiredness, irritability and contentedness, assessed by visual analogue scales, and the energy intake (fasting fixed to 1.1 MJ, 253 kcal/day, lactovegetarians mean 4.8 MJ, 1147 kcal/day) assessed by dietary recall were analysed. Lactovegetarians on their hypocaloric diet experienced more hunger before meals than fasters but a similar degree of tiredness. The combination of exercise and a hypocaloric diet, probably resulting in varying degrees of ketonaemia, seems to lead to responses which can be explained by a combination of psychological and physiological reactions. Fasters, although less hungry than lactovegetarians, complied equally well with the endurance program, but displayed lower mood. Key words: appetite, exercise, fasting, hunger, mood

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Published
1999-12-01
How to Cite
1.
Rössner S, Hylander B, Hägg A, Dye L, Lawton C, King N, Blundell J. Effects of fasting or a vegetarian diet on subjective ratings of appetite and mood during strenuous physical activity. fnr [Internet]. 1999Dec.1 [cited 2019Jul.16];:105-8. Available from: https://foodandnutritionresearch.net/index.php/fnr/article/view/100