I'm in grad school as well, eat very healthy and I spend $50-$65 a week on food depending on the week. The only reason my bill is so high is because I'm bulking and trying to gain a lot of muscle so I consume 3,000-4,000 calories a day, and roughly 200 grams of protein from lean protein sources (not including all the protein from my carb and fat sources). I eat 2 servings of vegetables a day minimum, and on a good day I have 4 servings. If I wasn't force feeding myself all day (for a limited time to achieve a specific goal) my grocery bill for healthy food would be $30 a week. I'm so sick of this healthy food is expensive bullshit. Maybe if you want healthy meals with 30 ingredients on par with something a personal chef would prepare it's expensive, but basic, tasty and healthy meals are cheap.