start exercising, going for walks, you will find your body and mind will force you to eat fruit and veggies and nothing processed.
you also can seriously just stop. its not hard. whats hard is keeping it up.
i suggest not a drastic detox but perhaps just vegetables and fruits, nothing processed, no bread, cheese, milk, chocolate, alcohol, sugar (perhaps maple syrup or honey but organic health food stuff don't get commercial stuff), no meat or fish etc.
just start waking up, down 3 glasses of water, get ready for work/school and then have breakfast with fruit - say a banana and an orange or kiwi fruit or berries and a good yoghuyrt - not those horrible danone types something ilke this brand i have here in australia
www.jalna.com.au - one with the ABC bacteria cultures and doesnt' have sugar or procssed fruit juice in it.
another alternative is freshly made smoothies
for a mid morning snack have some almonds and cashews and peanuts - RAW/natural ones, no salt or raosted (they use oil when they roast them) if you must have them roasted then toast it in the oven with no oil or salt and some carrots.
for lunch have some salads like three bean salad etc etc. but also have with it some nuts and hommus and fresh carrots or something for having the hommus with. it will fill you up.
the go for a walk somewhere, even if its 30mins,. make it a nice brisk walk
afternoon snack - more fruit
for dinner make yourself soem vegetable soup. fresh vegetables.
another alternative dinner is boiled egg and steamed veggies.
after dinner go for a walk again to help digest your food
or join a gym and do a workout with weights
meanwhile have a big water bottle and make sure you're drinking at least 2 of them
exercise is the key your body craves decent fuel such as the one mentioned above.
just refuse the pizza and lay off the weed
the first three days are usually the hardest to ween off weed and processed food so you may feel like shit, headacjy etc. just keep going and keep drinking water constnalty to flush it out of the system/.
you won't be sorry. your body is alreayd crying out for you to stop it.