Hi there i'd like to share a bit of this article about keeping motivated:
Nobody ever said that losing weight would be easy. Staying motivated can be hard work, but it isn't impossible. Accept that you may hit a motivational plateau. At first, losing weight and exercising is exciting and fun. After time, many people lose their motivation. The key to motivation is figuring out how to keep going, even when you don't feel like doing so.
Don't rely on willpower -- it simply doesn't work. Willpower is driven by emotions, which can be fickle. Emotions landed you into a weight problem, but they won't get you out of it. Instead, program yourself for success and stick to the program.
Give yourself permission to say, "I don't have to want to do this all the time." By acknowledging that, you can respond to it accordingly. People who watch what they eat and exercise regularly don't necessarily want to, but they understand that their actions have consequences. They've programmed themselves for success.