Body weight and fertility have long been linked, but now researchers say a single genetic "master switch" may be responsible for your weight and ability to reproduce.
Past studies have shown women with low body fat have trouble getting pregnant, because their body cannot sufficiently feed the fetus.
Researchers used mice to study a gene in the brain that had been linked to fertility and weight. They bred mice without the gene, and found they became obese and were infertile, a sign this gene controls body signals for a healthy weight and reproductive system.
Now that they have identified the gene, they hope to develop drug therapies that can turn it on in people who have mutations.