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They are probably desperate as no men approach them due to their weight. Also society and the media tell fat women they’re beautiful the way they are ‘you do you’ ‘don’t fat shame’ ‘big is beautiful’ etc. Fat men still get criticised ‘man boobs’ and ‘dad bod’ but fat women seem to be celebrated in some circles!! Very weird and not healthy at all.

Obese women desire you?
Maybe that’s a good thing. In some cultures, being heavy is a sign of well-being and fertility, whereas, being skinny is seen as suffering malnourishment, therefore lack of fertility. Ask anyone who’s survived a true famine. (That probably doesn’t refer to the women of whom you are speaking.)
Do consider this, that it’s possible for you to marry a beautiful woman who meets all your requirements of physical, emotional, intellectual, and spiritual beauty, and once she gives you children, she struggles to lose the post partum pounds. In some women, pregnancy changes the set-point weight limit. Short of feeling like she is starving all the time, she is going to be heavier than when you married her. When a woman falls below her metabolic weight, conception becomes more difficult. If she really forces the matter, her monthly cycle may not return. That’s why many female athletes no longer get their periods. Along with this comes a whole host of medical conditions, both physical and mental. In turn, that affects the spiritual and relational. (This is precluding super morbid obesity, ie. My 600 Pound Life!)
All I’m saying is to choose wisely. Physical beauty counts for very little when you're trying to get eight children from newborn to 13 into the van out of the house, ready for .Mass! Your wife will need your help. Don’t be obnoxious husband who sits behind the wheel, engine idling, blowing the horn. Then, don’t be surprised if she stress eats because of it.
A woman who feels secure and content is more likely to maintain a healthy weight and fitness than one who is constantly stressed out.