well it all depends though on the calories you intake (even though eating healthy is AWESOME, the amount of calories you intake and burn have more to do with it).
With my parents, i just estimated how much calories they burn in a day, and then planned their diet based on that.
However, again, i'm not an expert, but it seemed to have done my mom really well. She has now lost a total of almost 40 lb, she is off her high blood pressure meds, and she feels great.
My mom is 5'4'' and now 135 lb.
So this is what her diet consists of:
some sort of fruit
Salad (variety of veggies)
and something with tofu/lentils/etc (but not too big)
Fruit/small portion of almonds
different types of stirfry/tofu burgers/vegan pizza/etc etc but she keeps her portions controlled and small, and makes sure her sodium intake is low
carob chip bar
For seasons, i am normally really strict on her about that because i dont like too much sodium in her diet since she got off her pills. she has been doing an excellent job though on making sure she eats healthy
Now she is trying to keep her body in shape by walking 2 miles everyday before work.
"even though there is no such thing as perfect, there is nothing wrong with trying to achieve it"