Syn allowance

Just starting online SW. The guidance says to have 5-15 syns a day.
But can anyone tell me how to go about setting a syns value?
is it just down to how quickly to lose weight or is it about starting weight?
or something else?
many thanks for any thoughts.

You don't have to set a value as such. One day you might have five, another day you might use all 15, another day you might have nine and a half. It will vary from day to day and as long as it is between 5 and 15 you will be fine.

Thanks for that.