Portion size normality and additional within-meal food intake: two crossover laboratory experiments. Issue 4 (6th September 2019)
- Record Type:
- Journal Article
- Title:
- Portion size normality and additional within-meal food intake: two crossover laboratory experiments. Issue 4 (6th September 2019)
- Main Title:
- Portion size normality and additional within-meal food intake: two crossover laboratory experiments
- Authors:
- Haynes, Ashleigh
Hardman, Charlotte A.
Halford, Jason C. G.
Jebb, Susan A.
Robinson, Eric - Abstract:
- Abstract: Reducing food portion size could reduce energy intake. However, it is unclear at what point consumers respond to reductions by increasing intake of other foods. We predicted that a change in served portion size would only result in significant additional eating within the same meal if the resulting portion size was no longer visually perceived as 'normal'. Participants in two crossover experiments (Study 1: n 45; Study 2: n 37; adults, 51 % female) were served different-sized lunchtime portions on three occasions that were perceived by a previous sample of participants as 'large-normal', 'small-normal' and 'smaller than normal', respectively. Participants were able to serve themselves additional helpings of the same food (Study 1) or dessert items (Study 2). In Study 1 there was a small but significant increase in additional intake when participants were served the 'smaller than normal' compared with the 'small-normal' portion ( m difference = 161 kJ, P = 0·002, d = 0·35), but there was no significant difference between the 'small-normal' and 'large-normal' conditions ( m difference = 88 kJ, P = 0·08, d = 0·24). A similar pattern was observed in Study 2 ( m difference = 149 kJ, P = 0·06, d = 0·18; m difference = 83 kJ, P = 0·26, d = 0·10). However, smaller portion sizes were each associated with a significant reduction in total meal intake. The findings provide preliminary evidence that reductions that result in portions appearing 'normal' in size may limitAbstract: Reducing food portion size could reduce energy intake. However, it is unclear at what point consumers respond to reductions by increasing intake of other foods. We predicted that a change in served portion size would only result in significant additional eating within the same meal if the resulting portion size was no longer visually perceived as 'normal'. Participants in two crossover experiments (Study 1: n 45; Study 2: n 37; adults, 51 % female) were served different-sized lunchtime portions on three occasions that were perceived by a previous sample of participants as 'large-normal', 'small-normal' and 'smaller than normal', respectively. Participants were able to serve themselves additional helpings of the same food (Study 1) or dessert items (Study 2). In Study 1 there was a small but significant increase in additional intake when participants were served the 'smaller than normal' compared with the 'small-normal' portion ( m difference = 161 kJ, P = 0·002, d = 0·35), but there was no significant difference between the 'small-normal' and 'large-normal' conditions ( m difference = 88 kJ, P = 0·08, d = 0·24). A similar pattern was observed in Study 2 ( m difference = 149 kJ, P = 0·06, d = 0·18; m difference = 83 kJ, P = 0·26, d = 0·10). However, smaller portion sizes were each associated with a significant reduction in total meal intake. The findings provide preliminary evidence that reductions that result in portions appearing 'normal' in size may limit additional eating, but confirmatory research is needed. … (more)
- Is Part Of:
- British journal of nutrition. Volume 123:Issue 4(2020)
- Journal:
- British journal of nutrition
- Issue:
- Volume 123:Issue 4(2020)
- Issue Display:
- Volume 123, Issue 4 (2020)
- Year:
- 2020
- Volume:
- 123
- Issue:
- 4
- Issue Sort Value:
- 2020-0123-0004-0000
- Page Start:
- 462
- Page End:
- 471
- Publication Date:
- 2019-09-06
- Subjects:
- Portion size, -- Food environment, -- Norms, -- Food portions, -- Obesity
Nutrition -- Periodicals
572.4 - Journal URLs:
- http://journals.cambridge.org/action/displayJournal?jid=BJN ↗
- DOI:
- 10.1017/S0007114519002307 ↗
- Languages:
- English
- ISSNs:
- 0007-1145
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library STI - ELD Digital store
- Ingest File:
- 12649.xml