I've now been vegan for 6 years and with every year there is more and more vegan junk food and sweets out there, so today I'd say it is super easy to eat vegan and become fat as a vegan. I mean, every bigger supermarket has a whole row filled with vegan junk food and sweets and many cafes offer vegan cakes, even in our small city here... You can order vegan pizza in every italian restaurant, starbucks has a ton of vegan options, let's not forget pasta & french fries and vegan burger chains open in every bigger city.