Having the kind of body that easily puts on weight can be a blessing in disguise. It forces you to stay healthier.
In Haruki's words:
"...having the kind of body that easily puts on weight was perhaps a blessing in disguise. In other words, if I don’t want to gain weight I have to work out hard every day, watch what I eat, and cut down on indulgences. Life can be tough, but as long as you don’t stint on the effort, your metabolism will greatly improve with these habits, and you’ll end up much healthier, not to mention stronger."
"I think this physical nuisance should be viewed in a positive way, as a blessing. We should consider ourselves lucky that the red light is so clearly visible. Of course, it’s not always easy to see things this way."
"Life is basically unfair. But even in a situation that’s unfair, I think it’s possible to seek out a kind of fairness. Of course, that might take time and effort. And maybe it won’t seem to be worth all that. It’s up to each individual to decide whether or not it is."