found no evidence of any protective effects afforded by β-carotene supplementation on preventing and slowing age-related cataract. a second meta-analysis compiled data from studies that measured diet-derived serum beta-carotene and reported a not statistically significant 10% decrease in cataract risk. food drying caretenoids were found to be susceptible to a thermal degradation and discoloration upon drying, which are believed to associated with isomerization and oxidation reactions.