There is no "one diet" that is best.
Some people do find that lower carb, or lower fat, or higher protein, or normally balanced, diet plans work best for them. Nothing is set in stone.
As long as you eat less calories than your body is burning you will lose weight.
You should probably start with looking at what you DO eat now, and thinking about how you can move that more towards the guidelines Spark offers you, if it's not that close already, in little steps. Small changes are more lifetime sustainable than "going on a diet" and will add up over time. :)
Deb, in New Zealand