SHIRUKOFUKU- I have tight funds as well so grocery shopping does tend to be a headache. I'm not sure what you have available to you, but here what I do to cut my costs.
Every morning for breakfast, I have a protein smoothie. The ingredients are frozen fruit (MUCH cheaper than fresh fruit), nonfat yogurt (you can buy cheap store brand if you like it), and protein powder (I use Aria...it's $10 and lasts me about 3 weeks).
I have salads for lunch during the week. I keep them very simple, just lettuce and 1 or 2 additional veggies. I purchase all of my produce from a produce cart instead of a grocery store. If you don't have produce carts in your area, look for farmer's markets or even local farms.
Dinner changes every night and purchasing dinner food tends to be where I incur most of my food costs. To curtail this, I load up my freezer with frozen veggies whenever they're on sale. For meats, I look through the grocery circulars to see who's having the best deals. Again, if it's a great deal, I'll stock up and freeze food for later use.
It really comes down to being a smart shopper. Always, always compare prices at different stores before you go out. Also, it's better to go shopping with a list so you don't add a bunch of unnecessary items to your cart.
Also, avoid pre-packaged meals (i.e. Weight Watchers, Lean Cuisine) because they tend to be more expensive than if you just prepare a meal yourself. Opt for store-brand items, too.
Faithless is he that says farewell when the road darkens. -J. R. R. Tolkien's The Fellowship of the Ring
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