Associations between BMI and fat taste sensitivity in humans

Area of Science:

• Nutrition Science
• Sensory Science
• Human Physiology

Background:

• Individual differences in fat taste perception exist.
• The relationship between fat taste sensitivity, dietary fat intake, and body mass index (BMI) requires further investigation.
• Understanding these associations is crucial for addressing obesity and related metabolic disorders.

Purpose of the Study:

• To assess the reliability of associations between fat taste perception (oleic acid detection thresholds), hunger, dietary fat intake, and BMI.
• To investigate how repeated fat taste testing influences detection thresholds across different BMI categories.
• To explore correlations between fat taste sensitivity, dietary fat intake, and BMI.

Main Methods:

• 48 healthy adults (BMI 18.9-47.2) participated in 7 visits.
• Oleic acid detection thresholds were measured using a modified staircase method.
• Self-reported hunger, BMI, and dietary fat intake (Block Rapid Fat Screener) were assessed.

Main Results:

• Lean and overweight participants showed decreased oleic acid thresholds (increased sensitivity) over repeated trials, unlike obese participants.
• Lean plus overweight groups were significantly more sensitive to fat taste by visits 6 and 7 compared to the obese group.
• Positive correlations between saturated fat intake and fat taste thresholds were observed in lean and lean plus overweight groups, but not in the obese group. No association was found between fat taste sensitivity and hunger.

Conclusions:

• Fat taste perception and its association with dietary fat intake may differ significantly across BMI categories.
• Obese individuals may exhibit blunted or altered responses to fat taste, suggesting potential implications for appetite regulation and dietary choices.
• Repeated sensory testing is necessary to reliably assess taste perception and its relationship with physiological and dietary factors.