Which makes it dead simple. Not easy, simple.

If you want obese people to lose weight you want instructions making it not complex.

"Should I learn a new way to eat food, new recipes or start cooking for real? No thanks."

"Oh! I can just eat less and switch to 0 sugar soda; no need to make my life harder? Let's try this"

Once they have learned to eat less you can add the trick which is you can stuff your belly with 2lbs of veggies and get less than 1k calories. But for people used to the 5mn in the microwave way of cooking it's an added hurdle.