Nutrition: Contrary to popular belief, you do not have to eat less to lose weight. You body will adapt to maintain and retain energy when it recognizes a decline in the amount of calories it consumes. Now obviously, eating no food will eventually lead to rapid weight loss, but there are problems associated with starving yourself that aren't worth that trip. Actually, eating less can weaken your immune system, subjecting you to get sick easily, and eating less may cause headaches. So naturally, if I said "I need to lose weight fast, what can I do ?", many people would tell me to lose my appetite and consume less food. This is no longer the solution you should take.
Proper nutrition consists of eating foods in all of the food groups to give your body the energy and nutrients it needs. There are many vitamins, minerals, and micro-substances out there, so we won't list all of the ones your body needs, but it does need sufficient calories, Carbohydrates, Protein, Amino Acids, and each of the Vitamins to remain healthy. This is very basic, but it is a great foundation for structuring your diet. Remember, fats and oils are not bad for you. None of the food categories are actually bad for you. It is when they are not taken in moderation, that they become "bad".
In essence, losing weight through dieting requires you to eat, but to eat in moderation. Try lowering your daily calorie intake by 1,000, and eating wholesome foods. This will, most definitely get you to start seeing some results.
Exercise: I need to lose weight fast, what can I do? Once again, we come to this question, but in regards to exercise, there's actually not much you need to do. Many people who want to lose weight think that they need to get in the gym, do compound movements, isolation movements, and all sorts of other body building and strength training exercises to get thinner. What? This isn't the case at all. To lose weight, you need to burn more calories than you consume. The easiest, and fastest, way to do this is to do cardiovascular exercises. This includes, running, really. You can jog, run, or ride a bike, but any exercises in these categories work. Running, in particular, is great. Running on an incline is even better. The more energy, intensity, and time you put into an exercise, the more calories you will burn (important to remember). With this being said, you don't need a gym membership, and you may not even need to leave your house. A great exercise is running up and down your stairs for 30-45 minutes. Now, if you don't want your family to laugh at you, let's change the boundaries a bit; okay, so you may have to leave your house, but you certainly don't have to leave your neighborhood! Try doing laps around the block. Even if you can't run fast, it doesn't matter. If you want an extra burn, try running up a hill. The great thing is, the hill doesn't have to be steep.
Conclusion: Weight loss can be very challenging because of the confusion surrounding it. It is sort of like the old saying that too many hands in the soup will spoil it. In order to re-focus sometimes it is best to trust yourself just to a few basics from one source, because it is hard enough to stay on path with that alone.