Light Stable Isotope Ratios of US Pureed Baby Foods

Area of Science:

• Food Science
• Isotope Geochemistry
• Nutritional Science

Background:

• Isotopic composition of food aids origin verification and dietary research.
• Baby foods in the U.S. are isotopically understudied despite widespread consumption.
• Exploratory dataset of delta 2H, delta 18O, delta 13C, and delta 15N for pureed baby foods.

Purpose of the Study:

• To analyze the isotopic composition (δ²H, δ¹⁸O, δ¹³C, δ¹⁵N) of pureed baby foods.
• To identify isotopic variations related to food type, brand, organic labeling, and added water.
• To assess the potential utility of stable isotope data for baby food authentication.

Main Methods:

• Collected 117 samples of pureed banana, carrot, and sweet potato across commercial brands in the U.S.
• Analyzed cryogenically extracted water for δ²H and δ¹⁸O values.
• Analyzed residual dry solids for bulk δ¹³C and δ¹⁵N values.

Main Results:

• Significant isotopic differences observed between food types (banana, carrot, sweet potato).
• Organic labeled foods showed higher δ¹⁵N values.
• Foods with added water had higher d-excess and δ¹⁸O values.
• No significant isotopic differences were found across geographic purchase locations.

Conclusions:

• Isotopic patterns in baby foods reflect growing environments, farming practices, and processing.
• Stable isotope data can aid in studying and authenticating baby food production.
• Lack of geographic variation suggests homogenization of the food supply; consumer choice is key for infant diet reconstruction.