Hi
My experience of this is as follows:
It's great if you 1) eat three meals a day, 2) try to eat at or around 15g of fat per meal (even breakfast), 3) incorporate any sweet or fatty treats with the meal i.e. immediately after and within the 15g overall limit, 4) between meal snacking needs to consist of zero fat snacks e.g. fruit, non fat yoghurt, carrot sticks, pepper sticks, raw mushrooms, radish, tomatoes, rice cakes etc. even boiled sweets/liquorice in moderation (try to avoid sugar if you can as this bumps up the calories).
For instance I will have a 12g fat meal such as homemade pizza with cottage cheese, this leaves me free to indulge in a fudge or Turkish delight bar at 3g of fat but I need to have this within the hour of taking the tablet (as for the meal) in order for it to have maximum effect.
I am a snacker too and found this difficult at first but once you get used to it, it's not so bad and actually helps to retrain your brain.
If you snack on fatty foods between meals you may as well chuck the tablets away as they will do you no good at all.
I also find that zero sugar flavoured carbonated water gets me through the day and helps to keep me feeling full (I'm not a fan of plain water except for immediately on waking and just before bedtime).
I also stick to black coffee/tea.
If I'm in an uncontrolled environment e.g. a meal out with friends or a party with buffet etc. I specifically don't take the tablet as this can lead to a nasty accident through consumption of unknown quantities of fat. I try to limit this to a once-a-month treat though as it can steer you off-plan if it becomes a habit. So far I have only indulged three times.
I have consistently lost 1lb per week since starting, now 21lbs five months in.
Try to exercise a little - I've traded ironing with hubby for lawn-mowing and the dishes for car-washing, also taking the upstairs toilet (3rd floor) three times a day at work - I go even when I don't need to just to get the regular exercise - every little helps - good luck!