i second this. Try to be more active and continue working out. Enjoy being 15 and just eat smart. do not cut. However, quiting soda/juice would be a great thing to do. Those are 2 things that no...
you can eat whenever you'd like. theres no evidence that training while fasted promotes fat lose or muscle building. intermittent fasting is just a style of eating.
no, you should calculate how many calories you need using a calorie calculator (one like this: http://www.freedieting.com/tools/calorie_calculator.htm) and then proceed working out.
If your looking for a good fiber supplement then you should look at quest bars. They have Have around 20g of natural fiber depending on the flavor and they also have 20g of protein. Also there are...
Pro Bars are great. I like quest bars a lot but I noticed you said they were expensive so that may not be a good choice. Quest bars also aren't very calorie dense and you need to get as many calories...
If you like it for taste and not for the fats than buy some PB2 peanut butter flour and mix that in. That's what I do when I want a peanut butter taste in a shake.
