Severe maternal undernutrition during pregnancy and its long-term effects on the offspring health, with a focus on kidney health.

Maternal undernutrition during pregnancy is associated with adverse effects in the offspring during adulthood and contributes to the risk of developing a number of chronic diseases. Historical events, such as famines, allow us to study the effects that food deprivation in utero has on the offspring's health. In particular, the Dutch Hunger Winter (1944-1945) and the Great Chinese Famine (1959-1961) have been extensively analysed, and it has been shown that prenatal exposure to starvation increases the risk of cardiometabolic, mental and kidney disease in adult life. More importantly, the risk can be transmitted to future generations. However, not all studies agree on the thresholds of risk of exposed subjects or on the timing of starvation during foetal life that could be held responsible for these deleterious lifelong consequences. Gender differences complicate the picture. In this narrative review, we discuss similarities and differences between the two famines and compare the available data, seeking to determine what can be learned from these tragedies.