I'm 19 and still live with my parents, and around here there aren't a lot of organic shops that sell grass fed meat, organic butter, etc.
i just eat some 'normal' steak from the market, chicken from plastic bags, some fish also from the regular market, commercial brands of butter, whole but processed milk, and well.. veggies from the market, too.

will this make the weight loss really slow? will i be 'unhealthy'? of course i am better now that i dont eat grains, sugar and that stuff, but compared to a person who eats just grass fed stuff? :P