# Sex-dependent effects of a gestational ketogenic diet on offspring birth and lifespan

## TL;DR

A partial ketogenic diet during pregnancy in mice reduced litter size and altered offspring sex ratios, with long-term health effects depending on the sex of the offspring.

## Contribution

This study reveals sex-specific long-term effects of a gestational ketogenic diet on offspring health and lifespan in mice.

## Key findings

- Gestational KD reduced litter size, litter mass, and proportion of female offspring.
- Male offspring had reduced lifespan and late-onset weight gain.
- No significant effects on adult behaviors or reproductive success were observed.

## Abstract

Low-carbohydrate, high-fat ketogenic diets (KDs) are used for treating drug-resistant epilepsy, and other potential benefits, such as treating neurological disorders, metabolic syndrome, and cancer are being explored. In addition to these and other medical applications, KDs have also become popular for rapid weight-loss and enhancing athletic performance. However, the potential negative effects of exposing developing offspring to KDs during pregnancy (gestational KD) are poorly understood, and especially the long-term health consequences. In this study, we investigated the effects of a partial gestational KD administered during the second half of pregnancy and assessed the consequences on the offspring over their entire lifespan. We found that, compared to controls, a gestational KD significantly reduced dams’ litter size and litter mass and altered the litter sex ratio, reducing the proportion of female offspring, which also had lower body mass early in their life. In contrast, male offspring exposed to a gestational KD suffered a significantly reduced lifespan and a late-onset increase in body mass. We found no evidence that a KD diet influenced some adult offspring behaviors (locomotion, anxiety, depression, circadian rhythms, food and water consumption) or reproductive success. Our results with laboratory mice may not translate to human health, but nevertheless, they should raise concerns that even a partial maternal KD during pregnancy may have detrimental effects on offspring health and longevity.