Olfactory and gustatory functions and its relation to body weight

Area of Science:

• Sensory Science
• Human Physiology
• Nutrition Science

Background:

• Body weight, particularly Body Mass Index (BMI), is a significant physiological factor.
• Sensory perception, including smell (olfaction) and taste (gustation), plays a crucial role in health and well-being.
• Understanding the relationship between BMI and sensory function is vital for public health.

Purpose of the Study:

• To investigate the influence of Body Mass Index (BMI) on olfactory and gustatory perception in healthy adults.
• To determine if different BMI categories affect odor and taste thresholds, discrimination, and identification.
• To explore potential correlations between BMI, olfactory, and gustatory sensitivity.

Main Methods:

• Psychophysical measurements were conducted on 66 healthy adults (ages 20-56).
• The "Sniffin' Sticks" test assessed olfactory thresholds, discrimination, and identification.
• "Taste Strips" test evaluated gustatory function for sweet, sour, salty, and bitter tastes.
• Participants were categorized into four BMI groups (15-19.9, 20-24.9, 25-29.9, >30 kg/m²).

Main Results:

• No overall effect of BMI on general sensory sensitivity was observed.
• A significant increase in olfactory thresholds was found with rising BMI (p<0.047).
• Gustatory thresholds for "salty" taste were significantly higher in individuals with higher BMI (p<0.035).
• Olfactory discrimination and identification, as well as thresholds for sweet taste, were not significantly affected by BMI.

Conclusions:

• Increasing Body Mass Index (BMI) is associated with decreased olfactory and taste sensitivity in healthy adults.
• Elevated BMI correlates with reduced ability to detect odors and perceive salty tastes.
• These findings suggest that body weight impacts sensory perception and may inform understanding of related pathophysiological mechanisms.