Of course you can if you have to. Heck, if you eat nothing but Ramen noodles, rice and fruit you can probably have enough left over for a beer or two.
You would be suprised how very well a person can eat on 30 dollars a week, and it doesn’t have to be just ramen noodles and rice and beans either. You just have to buy the right things and cook as many things from scratch as you can just like our grandmothers all did every day.
My husband is well over 6 feet and close to 300 pounds (a really big guy) and my stepson is not much smaller and those two men are getting very well fed in our house even though my monthly food budget for the entire family of 5 is $200 and that includes three meals a day for everyone in the family. We have a very well balanced diet and meat as a part of every dinner I cook. I use mostly all fresh fruits and veggies but supplement those with some canned and frozen produce.