Ovarian apoptosis is regulated by carbohydrate intake but not by protein intake in speckled cockroaches

•Food availability affects apoptosis in female speckled cockroaches.•Apoptosis and necrosis responded differently to protein and carbohydrate consumption.•Carbohydrate limitation induced apoptosis and reduced female fecundity.•Necrosis was induced by food limitation but independent of dietary protein-carbohydrate ratio.