Life cycle hotspots in chocolate production: Ingredient formulation, processing technologies, and pathways toward...

Chocolate manufacturing is both resource- and energy-intensive, posing significant sustainability challenges across global food value chains. This study conducts a comparative life cycle assessment (LCA) of four major chocolate types-dark, milk, white, and compound-and two processing technologies, conventional conching and ball milling, to identify key environmental hotspots and improvement opportunities. Unlike previous studies that typically focus on single product types or generic supply chains, this work integrates multiple formulations and alternative processing routes within a unified, factory-level LCA framework. Following ISO 14040/44 standards, the analysis adopted a cradle-to-retailer boundary and employed the ReCiPe 2016 Midpoint (H) method with Monte Carlo-based uncertainty assessment. Results indicate that ingredient formulation dominates the life cycle impacts, with raw materials accounting for over 60% of total environmental burdens. White chocolate exhibited the highest global warming potential (4.06 kg CO₂-eq/kg), driven by high milk powder and cocoa butter use, whereas dark chocolate showed the lowest (2.32 kg CO₂-eq/kg). Compound chocolate benefited from reduced cocoa content but incurred elevated impacts from palm oil and milk powder in water- and toxicity-related categories. Processing choice contributed marginally (<1%) to total GWP; however, ball milling increased electricity consumption and fat requirements, slightly worsening particulate matter and resource depletion indicators. Sensitivity analysis revealed that replacing fossil-based electricity with renewables could cut GWP by approximately 9%. These findings highlight ingredient composition and energy sourcing as the most effective levers for advancing low-impact chocolate production, outperforming incremental process optimization in sustainability gains.