I read your comments because I've heard so much advertising about the lemon detox diet and was wondering what your views are of it. It doesn't sound all that appealing and seems a like a chore to go through. And laxative is for people who have trouble with digestion process.
You sound like a lovely healthy 17 year old and you say you want to lose between 2-4 kg. If this diet doesn't work for you or is too unpleasant, have you tried the Tony Ferguson Shake? Its an Australian product. I'm not sure what the age limit is for it, but the shakes are very very delicious (not the usual dietary powdery tasting shakes). All you do is have a maximum of 2 shakes a day and one good meal (the meal must have veges and protein). You can have fruits in between for snack, drink at least 2 litres of water everyday, and the 2-4 kilos will drop off you within a month. And if you do some walking during that time, it will come off sooner.
This shake is far more pleasant than what you have described with the lemon detox diet. When you take the shake, it keeps you full, however you have to give up alcohol and caffeine during that time to work (I still have some of it) but it reduces the full effective of the shake on your weightloss.
You can purchase the shake online or visit any of the relevant chemist, they will give you a guideline on how to do the diet and a months supply.
My niece used in, ate well, and exercised, and she looks beautifully slender which made me want to do it too.
Please let me know if I can help you further, I will keep reading your progresses and wish you well.
Regards - moeharley