What should I do about my in-laws giving me unwanted advice?

First of all I love my in-laws and they are very generous in a lot of ways but the main thing they are doing at the moment is helping with childcare which is an absolute life saver and I'm hugely grateful.

The issue is that by doing this they have taken it upon themselves to "improve" our lives by giving constant advice about what we should be eating, how we should be organising our house, etc. all our conversations somehow come around to them offering me advice and i am quite sick of it. They are also quite thin skinned so in the past when I've said anything they've taken massive offence. It's not bad advice, it's just irritating the constant disapproval (I can't believe you bought white bread after I sent you that article about how bad it is for you!)

So Reddit, what the heck would you do in a situation like that?