Dieting and cleanses don't work long term because they are too extreme a shift from one's current behavior. First, the subconscious brain will resist the changes (because it prefers known behaviors/habits), making them difficult to sustain over time.
Even if the person is able to fight through brain resistance and "stick it out," they will then face biological resistance. Many animal and human studies have found that long-term calorie restriction (a staple of dieting and "cleanses") causes the body to significantly lower metabolism and increase food efficiency. This combo makes weight gain easier and weight loss more difficult.
It's almost laughable how we react to studies like the one on The Biggest Loser. Here's an excerpt from Mini Habits for Weight Loss:
"What do you think is the recipe for weight loss on the show, the one that produces massive double-digit and even triple-digit weight loss numbers in a short amount of time? It’s the same one we just covered. Exercise for hours every day and severely restrict your calorie intake to create a big calorie deficit. Yep, that will do it! Considering the information we’ve just covered, go ahead and take a guess about what happens to these contestants during and after the show.
During the show, contestants lose a massive amount of weight, some of them dropping well over 100 pounds. What happens next?
A study followed 14 Biggest Loser contestants for six years after the show, and all but one of them regained weight after the show. Four became heavier than when they started the show. Even worse, nearly all of them suffered from abnormally low metabolism for their size, and lower metabolism than when they started. Low metabolism makes weight loss much, much harder, and weight gain effortless.
When this study came out in May 2016, I saw Good Morning America discuss it, and those on the show acted as if we hadn’t known about this concept for decades. My first thought was, 'Why are they acting surprised?'"
This how the body fights to keep its former weight, and it's extremely effective! We see it as a bad thing, but it's a phenomenal survival adaptation. If you lived in a time of famine, such an adaptation could save your life.
Mini Habits for Weight Loss is a game changer. It is one of the only weight loss strategies designed to avoid neurological and biological resistance. It does not target external change, it targets subconscious change. It's not a plan for 30 days, it's a plan to change your preferences for life.
FOUR DAYS UNTIL RELEASE!
Pre-order here: http://hyperurl.co/r615ze
 Callahan, M. (2016). The brutal secrets behind “The Biggest Loser”. Nypost.com. Retrieved 26 August 2016, from http://nypost.com/2015/01/18/contestant-reveals-the-brutal-secrets-of-the-biggest-loser/
 Fothergill, E., Guo, J., Howard, L., Kerns, J., Knuth, N., & Brychta, R., et al. (2016). Persistent metabolic adaptation 6 years after “The Biggest Loser” competition. Obesity, 24(8), 1612-1619. http://dx.doi.org/10.1002/oby.21538