However, I've lost significant girth and he hasn't.
Just as sleep helps maintain a healthy balance between the hormones that make you feel full leptin and hungry ghrelin , the lack of sleep increases ghrelin levels, and lowers the leptin levels, which adds up to making you feel hungrier than you would have been if you had slept well.
Excess weight increases the risk of related health problems including type 2 diabetes and heart disease.
There are two main reasons for that.