Revealed: How a can of DIET Coke makes your body store fat, rots teeth and affects you in the same way as cocaine within ONE HOUR. A UK pharmacist has shocked fizzy drink fans by releasing a step-by-step guide to the dramatic way a can of Diet Coke affects the body from 10 minutes after the first sip until an hour later.
For girls. puberty can start anywhere between the ages of 8-13 years (and sometimes earlier or later) but often the first changes happen around 10 or 11 years. For boys. the first changes often happen a bit later than they do for girls, somewhere between 10 and 15 years.
So that's what's really happening during puberty â it's all these new chemicals moving around inside your body, turning you from a teen into an adult with adult levels of hormones. Puberty usually starts some time between age 7 and 13 in girls and 9 and 15 in guys.