If not for shidduchim then for Hashem Yisborach
who says in the Torah “Ushmarted Me’od L’nafshoseichem”.
Then I assume that ALL the Yeshivah bochurim AND their rebbeim are also no longer smoking, are not sitting hunched over their Gemarahs for long periods of time (because it is VERY bad for both the circulation and the spine), and are exercising regularly so THEY do not become overweight due to their sedentary lifestyle. Also, re: looking attractive for their spouses, presumably they are also using Rogaine, so as not to go bald and thus be less attractive to their wives. Are they bathing regularly, and making sure their beards are not unkempt, that their shirts are tucked into their pants, and that they use deodorant regularly and brush their teeth?
EVERYONE needs to look out for their health, but not being a size two has nothing to do with health and has EVERYTHING to do with extreme shallowness and a non-Torahdig way of looking at one’s priorities of life.