(how much exercise is advisable to do a week to lose weight)

Have you made any logs of your exercise. It is always best idea to make one.

Do exercise at least 5 times a week for minimum 30 minutes daily to get help in your weight loss purposes.
Do focus on high intensity cardio and do your routine workout in morning time for the quick results.

To improve the fitness

Why not consider hiring a personal trainer? The one hour sessions are filled with high impact exercises which bring better results than for example, 1 hour of running. This is a great way to loose weight and tone up as there is someone there stood with you to motivate you and achieve them fitness goals.
Check out www.thefitnesssuiteelland.co.uk ; We are Yorkshires premiere personal training facility.
Good luck

Originally Posted by claire

I am currently on a diet and eating healthily but am not noticing
results -is exercising 4/5times a week for half hour each day enough?

Much better if you are exercising in an hour or 2 hours.