If you've doing these things already for awhile, then no, it won't suddenly start making you lose weight. If you just started doing this, then it might. If you were completely sedentary your whole life and you're young, starting any exercise program and eating better should start showing some results quickly. If you were really active most of your life and stopped and now start walking, well, no, it's not enough because your body was used to a lot more and when you stopped, your metabolism slowed down. Since we know nothing about you, there's no way to tell you, but these are some of the considerations. Also consider that losing weight is only quick if you do radical things that won't last, whereas losing weight slowly by eating better and exercising more takes time but will last. Given that your fiance appears to love you the way you are or you wouldn't be getting married, what's the hurry? Losing weight slowly will keep it off because you'll have permanently changed your life and your health. Losing fast, yeah, there are ways to do that, but then you'll go back to whatever got you where you are. But yes, if you want to lose fast, walking won't do it. You don't burn enough. But if you aren't used to exercise, starting an intense workout will just injure you -- you have to work into it slowly and carefully. Complicated.