What kidneys do during water fasting means you need supplement calcium, magnesium and esp salt and potassium.
For salt and pottasium, Drink a 10oz glass water, 2 tbs applecider vinegar, 1/4 tsp sea salt, 1/4 tsp cream tar tar
Helps me
Growing is not just getting taller. Humans are considered growing until about 24 years old. While growing, body consumes and needs much more energy. As a medical professional, I would not recommend water fasting for long time for you unless some specific conditions exist. Until you complete your adolescence (about 24 years old), it is better that you collect information about every kind of fasting and veganism. Do not trust every information you find instantly. Research more, adapt your diet and take professional opinions if you can. I believe you can try intermittent fasting. Which is shortly you only eat only at a period of time in a day and eat nothing at the other time of the day. You have to adjust what you eat of course.
Try OMAD or 20:4 instead of longer fasts. You can do OMAD every day if you like. Also, water and pinch of salt every time you feel headachy. Exercise helps in keeping off what you gained and making you feel confident about yourself.
Just lol at everyone on here. Provided that you are otherwise in good health and have significant bodyfat to lose, 7 days will not kill you or stunt your growth. The main thing is to make sure that you get adequate electrolytes during the fast. Pragmatically this means adding sodium and potassium to your water. Look it up to figure it out, if you can’t…you shouldn’t be fasting.
I will say however that 7 days is probably about as long as you should go given that a fast longer than that may start to impact you in unforeseen ways and moreover, 7 days is more than enough to realize your fat loss goals.
I also want to second the intermittent fasting recommendation as a good long term strategy to keep the weight off.