Why do some people get cold after eating?

Answer

Dear Sabine,

Just after eating, the body needs energy for the complex process of digestion. Some of the energy you use to maintain your basal metabolism (such as maintaining your temperature) then temporarily concentrates around the abdominal viscera.
That is why it may be that there is just a little too little energy left to keep the surface of your body warm. Other processes (such as fighting bacteria, for example, also something that happens continuously) can be temporarily less active at that moment, but unlike heat loss, you cannot immediately observe this.
Of course it also depends on your personal heat/cold sensitivity. Therefore, not everyone will feel this (equally).

Hopefully I was able to help you with this.
Kind regards,
Merlin