Skeptical. If you have the will power or habit changing power to make rice such a staple of your diet that this makes a difference, then you also have the ability to just eat less food. Same thing.

Shit diet (cakes, bacon, fries etc.) -> heavy low carb rice diet

Shit diet -> Good diet (balanced, carbs, protein, fat, veggies)

I would say the second transition is easier. Perhaps more expensive though.