Our body uses fuel throughout the day, so it makes sense to keep the fires stocked up throughout the day. Most health experts agree that eating many small meals is a lot better for you. Rather than stuffing out system full 3 times a day when out body doesn't need it, and letting it run dry when it does need some fuel.
This sounds like an easy one, but only eat when you are hungry! We tend to stick rigidly to our mealtimes and therefore we are really hungry when we sit down to eat and wolf everything on the plate down. Eat slower and pay attention to how you feel, the aim is not to empty the plate, it is to fill you up.
People have all sorts of excuses for why they eat everything on the plate, the oldest one in the book is that it is a sin to waste good food. Is clogging up your arteries and putting excessive wear and tear on your joints by being overweight not 'sinful' then? Don't make excuses, take action, stop finishing the plate full!
You will find that it is easy once you start to decrease the amount of food you put on the plate each time. Your body and mind adjust to having less food so you don't feel hungry afterwards, and you will feel much better as you are not bloated and heavy from having your stomach weighed down with too much food.
It is a lot easier to be tempted if you have temptation in sight - get rid of all the bad food from your cupboards etc. If people in your house want that kind of food then get them to keep it in the garage instead! That way they me be less tempted as well as it is harder to go and get. You will find it much easier to stick to your healthy eating routine when you do not tempt yourself every time you walk into the kitchen.
Case in point, if you know that TV ads are your vice, don't look at them. If you have a buddy or family member who likes to eat pizza, leave the dining area when they are eating. You will only be torturing yourself into inevitable failure by sitting there and watching your family member eat a lovely hot pizza. You have to be strong and leave the difficult situation.
Changing your lifestyle is harder than you think, but once you have lose the weight and kept it off for a few months, then these guidelines above become second nature and you will find it much easier to keep your weight stable. Put in the effort at the start and it will be well worth it when the new slim you looks in the mirror each morning.