What is an appropriate reaction?

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So, I think nearly everyone has experienced someone ranting about their body at some point or another.

When somebody is complaining about their body, saying their fat, or they need to lose weight, or anything really, how should someone respond if at all?

My husband says not to say anything and to just listen because they are just “venting”, but it’s such an awkward situation for me to be in because I want to comfort them or tell them it’s ok.

I’m tempted to give them advice on how to fix the problem, but I’m very slender and I think people would take that the wrong way.

How do you respond to people putting themselves down to you?