Chewing increases postprandial diet-induced thermogenesis.

Area of Science:

• Metabolism and Nutrition
• Physiology

Background:

• Slow eating, characterized by prolonged chewing and tasting, is linked to appetite control and preventing obesity.
• Postprandial energy expenditure, or diet-induced thermogenesis (DIT), is elevated by slow eating, but the underlying mechanisms remain unclear.
• The role of oral stimuli, such as taste and chewing duration, in modulating DIT requires further investigation.

Purpose of the Study:

• To determine the impact of oral stimuli (taste and chewing duration) on diet-induced thermogenesis.
• To differentiate the effects of oral stimuli from the physical properties of food on DIT.

Main Methods:

• A randomized crossover study was conducted with 11 healthy, normal-weight males.
• Participants underwent three trials involving consuming liquid food: normal drinking, drinking after tasting, and drinking with chewing during tasting.
• Diet-induced thermogenesis was measured across the different conditions.

Main Results:

• Oral stimuli, specifically the duration of tasting and chewing liquid food, significantly increased diet-induced thermogenesis.
• The observed increase in DIT was attributed to the sensory experience of eating, not the volume of the food bolus.
• Prolonged chewing and taste stimulation were identified as key factors enhancing DIT.

Conclusions:

• Oral stimuli, including taste and chewing, play a significant role in increasing diet-induced thermogenesis.
• This finding suggests that enhancing oral stimulation during eating could be a strategy for preventing overweight and obesity.
• The study highlights the importance of the eating process itself in metabolic regulation.