Male and female gametes are often embedded in fluids that are produced by gonads and other reproductive tissues. Female reproductive fluids, usually called ovarian fluids (OF), which often constitute a relevant volumetric component of the egg mass, are rich in ions, sugars, and proteins, and are involved in several functions, from protecting gametes to facilitating fertilization, and often act as mediators of postmating sexual selection. Despite their applied and evolutionary importance, we know virtually nothing about the costs of female reproductive fluid production. We investigated the effect of nutritional condition on OF quality by experimentally manipulating the diet of two groups of female guppies (Poecilia reticulata) which were maintained for 20 days either at a restricted diet or had ad-libitum access to food. In this species, OF enhances sperm swimming longevity and velocity (a predictor of sperm competition success) and mediates postcopulatory inbreeding avoidance. We found that sperm velocity was significantly lower in the OF of diet-restricted females, indicating that OF quality is dependent on female nutritional condition. Our results demonstrate that OF represents non-trivial component of female reproductive investment and provide a tool to investigate which OF constituents are involved in modulating OF-sperm interactions and fertilization.