Hot-take, but I think his conspicuous gut might be more of a result of horrible posture than fat. If you look at how the back of his blazer hangs, you can tell the small of his back is bending inwards and pushing his abdomen out. Also, his shoulders and neck are pushed forward which tells me he has what is called a "sway back posture":
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This is very common and arises from a largely sedentary lifestyle. Rudy has a "job" where he sits all the time so he's a prime candidate for developing a sway back. Obesity is often co-morbid with developing a sway back posture, so the "lol fat" posters may still be correct.