Need to lose 40lbs

You may want to elaborate on "can't seem to lose." How long has it been, what have you been doing... etc. In the meantime, here's a great flow chart created by @lemonlionheart may help:




Here's a great post about keeping a food diary that might offer some insight: http://community.myfitnesspal.com/en/discussion/10191216/the-most-important-thing-you-can-do-to-lose-weight#latest

If you still have questions, please ask.