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We studied the effects of starvation on changes in neutral lipids in male and female  Drosophila melanogaster  (fruit fly) at different ages. When flies were subjected to starvation, the mortality rate was observed to be age- and gender-dependent: male flies died earlier as compared to female flies, and older flies died earlier than younger flies. There was an increase in the number of dead flies and the levels of diacylglycerol (DG) with starvation time. This increase in DG was observed much earlier in male flies as compared to female flies, which correlated with earlier death in male flies during starvation in comparison to female flies. We also analyzed the levels of triglycerides (TG) and lipase activity during starvation of flies. The levels of TG decreased depending upon the duration of starvation in both male and female flies. Interestingly, we observed that like DG, there was also an increase in lipase activity due to starvation, which also correlated with earlier death in male flies as compared to female flies. Our results suggest that increase in DG levels and lipase activity due to starvation may be the main cause of death in the flies.

Effects of Starvation on the Levels of Triglycerides, Diacylglycerol, and Activity of Lipase in Male and Female Drosophila Melanogaster