Hi adya29,
Alli can be taken up to 1 hour before, during or up to 1 hour after a meal a be effective. It is suggested to be taken with a meal as a reminder to take the dose and as a motivator to stay within your caloric and fat gram guidelines.
You have been taking Alli as suggested. You are not experiencing any effects since you are eating within the guidelines and doing it right. Soon you will start seeing and feeling the changes on your body.
Hope this helps.
Sophia De Monte RPh