Fluoride Exposure from Soybean Beverage Consumption: A Toxic Risk Assessment

Area of Science:

• Food Science
• Environmental Health
• Toxicology

Background:

• Increasing consumption of plant-based milk alternatives like soy milk.
• Soybean crops can be exposed to chemical contaminants, including fluoride, during cultivation.
• Excessive fluoride intake is linked to dental and bone fluorosis.

Purpose of the Study:

• To quantify fluoride concentrations in leading soy milk brands.
• To assess the toxicological risk associated with soy milk consumption based on fluoride levels.
• To determine the contribution of soy milk to the daily fluoride intake.

Main Methods:

• Analysis of 30 soy milk samples from three popular brands (A-Brand, B-Brand, C-Brand).
• Quantification of fluoride using a fluoride ion-selective potentiometer.
• Evaluation of consumption patterns (1-3 servings/day) and comparison with the Acceptable Daily Intake (ADI).

Main Results:

• Fluoride concentrations varied by brand: A-Brand (15.5 mg/L), B-Brand (11.3 mg/L), and C-Brand (8.5 mg/L).
• A single serving (200 mL) of soy milk contributed a significant percentage to the ADI for infants and children.
• Teenagers and adults did not exceed the ADI (10 mg/day) based on soy milk consumption alone.

Conclusions:

• Soy milk consumption can substantially increase daily fluoride intake.
• There is a potential health risk, particularly for vulnerable groups like infants and children, if ADI is exceeded.
• Recommendations include monitoring fluoride levels in raw materials and finished soy products to ensure consumer safety.