To achieve weight loss as a New Year's resolution, consistency and making small changes are key, for example, if you're shooting to lose weight and decide to go vegetarian to help yourself get there, you'll want to consider if this is going to be a drastic change for you. If you currently eat a lot of meat, you may want to think about setting a different short-term goal, like making a couple of meals per week vegetarian, rather than doing too much all at once.