A little courtesy would be niceWeight gain, especially in this century where everybody is seemingly obsessed with being "slim” comes across as a very a sensitive topic, so raising it bluntly may become a mean gesture. Quite similarly, telling them off that they are growing fat is literally another way of saying that their level of food intake is gross (read gluttonous), or they have become lazy toads. And this is the last thing anyone would want to hear from someone they expect to be loving and caring. However, the good news is that, you can help your partner lose those extra pounds without having to rub it in their face. For example suggesting they join you for a stroll, swim or work out at the gym, is a much more courteous alternative.  However, achieving this requires extra effort, which involves leading by example and not playing double standards. For instance insisting that they order a salad  in a restaurant  while  you shamelessly munch away on a fat  burger with oily  fries in tow, or instructing them to hit the streets for a jog while you sit at your computer like a dumb sod,  is not only discouraging but  also an exhibition of  extra ordinary insincerity . It’s also paramount to initiate talk about healthy living practices. For example come home from the gym and say "God I feel great!” or "Sweetie, what are we cooking tomorrow night, I’m really keen to try this [insert healthy recipe]”. And doing it together adds meaning to it.Ironically, weight gain by any party in a marriage can also be veiled as good news; it makes one less attractive to the opposite sex, so this may reduce occurrences of extra marital affairs. There is this misled perception that mediocre sexual performance is a reserve for fat people. Wherever this claim originated shouldn’t be far away from an alien sphere because there have also been similar complaints about slender people. Note that sexual incompetence is caused by various factors regardless of one’s size and should never be an excuse to scorn people with "generous” body sizes.