I spent all of my foundation stage in adaptive child mode being controlled by the conrolling parent. I embraced that state because it got me to where I wanted to be. For me the foundation stage was easy to follow because the rules were so strict which is why it suited me.
Apart from the science bit of the diet there is the emotional side too. LL gives you the opportunity to have a complete break from conventional food and drink and re-evaluate your whole relationship with it. It gives you the chance to retrain your taste buds too. Some people may find having something conventional a bit of a pull towards complimentary foods for example 'I'll just have a diet coke' could lead to 'I'll stick a vodka in that, one won't hurt'.
It is up to the individual to make an adult choice about what is right for them. For me, compromising my diet isn't about cost or about what others think seeing me with a glass of water, it is all about me and what is best for me. Only one person will know what is right for you and that's you. Personally I was scared of getting away with compromising my diet because it would have been the start of a slippery slope down towards something I couldn't have got away with.
In short, think about why you want to do something and then examine what your motives are for it. If there is nothing sinister in there then consider if you can cope with moving off the path and if you can then why not

I couldn't risk it so I didn't at that stage so I didn't just for the sake of a coke.