I'm hearing a lot about raspberry keatones, coffee bean extract, green tea, etc. For weight loss. Are any of them effective? What's the best to try?

Green tea w/o sugar. Helpful weight loss diets have natural foods that take time to chew but contain few calories. Examples include carrots, celery, and iceberg lettuce (little/no salad dressing). When shopping for fruits, buy small ones no bigger than a tennis ball, because fruits have sugar. Drinks without calories include water and green tea. A calorie is a calorie, but surely avoid sugar & simple starch calories.