I was just wondering if this is true or not.

My mum said that you should never have a warm/hot bath or shower after eating a meal because you will be s*.
I don't know whether it's true or not. On one hand I trust what my mum says but on the other hand, I've seen on the cooking show Come Dine With Me whereby people eat food and winein a hot tub. Now I'm really paranoid. If its true, how long should you wait after a meal to have a bath?

Thanks.