I think people who struggle with losing weight will be successful when they have made up their mind to do it and not because someone else told them to. For example if I was eating junk food and dh said "I don't think you should be eating that and you need to lose some weight " that woukd be counterproductive and make me want to eat it more. If however I said to DH "omg I have put on so much weight I need to lose it" and he was supportive and said "I love you doesn't matter your weight but if you want to lose some then let's not have temptation in the house and let's go for a walk and eat out less etc" that woukd be so much more helpful. I think people know when they are overweight and what they need to do. They may get help eg from dietitian, trainer etc but what they don't need is someone saying "you need to lose X amount of weight " unless there is a health reason.