Which diet is the best?

Often we come across all sorts of dieting protocols and countless testimonials about how these approaches work; each one of these diets seems to be better than the next. They all promise the same things; amazing results and years of healthy living.
But despite all these amazing benefits, why do so many dieters fail?
The first quarter of the new year is when most people generally embark on this ‘health journey’. But about 80% of these people quit on their goal halfway through. So what are they doing wrong? Is it their lack of commitment or maybe a bad dieting choice?