What you do is to eliminate refined carbohydrates from your diet (sugar, flour, bread, cake, pasta, pastry, rice, potatoes, etc), and stick to modest levels of unrefined carbohydrates (fruit, root vegetables, etc) while ensuring you eat plenty of green vegetables, meat, fish, and dairy to keep up a good intake of fats and proteins. At the same time keep doing some regular exercise.
Eliminating refined carbs prevents blood sugar spikes which your body handles by converting the excess sugar to body fat. Keeping down the unrefined carbs makes your body use body fat for fuel. Keeping up your fats and proteins intake prevents your metabolism going into 'famine' mode, which is what trips dieters into bingeing. Exercise speeds things up by increasing the amount of fuel you need, and by building muscle, which also burns more fuel.
So, it's goodbye to: beer, sweet wines and spirits, cake, pies, pizza, chips, rice, bread, potatoes, fizzy drinks, sugar, and anything that you don't know what's in it. Hello to dry wines and spirits, nuts, seeds, green vegetables, fresh fruit, water, cheese, cream, olive oil, meat, poultry, seafood, and food you prepare yourself from any of the above ingredients.
There are some downsides, it takes a couple of weeks of self-discipline for new eating pattern to become a habit; shopping and preparing food this way takes more time than using factory-made crab-loaded additive-stuffed package meals; sometimes eating away from home is a challenge - when presented with a sandwich lunch I have been known to eat the filling and throw away the bread.
Read more in any book on Atkins, South Beach, Low GI - they all converge at much the same point.
© steve_roberts 2007