If you are buying processed foods, then you should always check the labels for thickeners and stabilizers as these more often than not contain gluten as they are wheat based. However try to avoid these types of food and eat as naturally as possible, there is nothing better for you than a variety of fresh fruit and vegetables.
Alcohol, there is no doubt about it that booze piles on the pounds, a glass of wine contains as many calories as a cake, its liquid sugar. Wine contains 80 calories in just one small glass. If you like a drink then consider white spirits instead.
Eat regular meals, particularly breakfast, it kick starts the metabolism and gives you the energy you need to get up and going and will help prevent snacking before lunch.
Portion control is essential too, think about using a smaller plate so it feels like you have more to eat and stop eating when you feel full.
Be sensible with carbohydrates, although there are gluten free alternatives to pasta, bread and rice, eat them in moderation. I discovered a wonderful substitute to spaghetti the other week, I purchased a spiralizer, basically a wonderful tool that makes courgettes into a pasta alternative. All you need to do is lightly pan fry for a couple of minutes until they are softened or alternatively immerse them in boiling water for about a minute and serve as you would spaghetti. They are pretty much calorie free and delicious.