<human>: I've found, with talking with many, many friends of all types of couples (F/M, M/M and F/F) that it's really hard to take advice (hear "it") from your significant other. 

For example, say you need to lose weight, you know, your partner knows it. But if they say anything about it, there's no WAY you're going to do it. It has to be your *own* idea or something. It's not just exercise either. It works with pretty much any change in behavior. Cleaning, better with money, any kind of general personal improvement. 

I'm NOT saying I'm not this way either, though I do my best to try to listen to my wife's suggestions. But why is it that if our friend simply said, "Hey, you should really help with the dishes more," it gets a totally different reaction then if the wife says it? It goes both ways too. If I say, "You need to try to safe a bit more money," to the wife, it doesn't go down so well. But if her friend said the same thing, she'd nod in agreement and have a whole conversation about it!

What's the best/worst is when it's a thing that they've even said they want to change! 
John, "I want to eat more healthy."

...4 hours later... 

Jane, "I remember you saying you wanted to eat more healthy, you should probably skip dessert."

John, "Don't tell me what to do."

Jane, "...."

Why is that? Is it a cultural thing? Would LOVE to hear from multiple cultures!

I realize that not EVERYONE is like this, especially on every subject. But I'd love to hear theories about how you get through it with your significant other, and what helps you to communicate those issues most effectively.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Why can't we take advice from our significant other? Especially when they are the one's that love us the most?!