When it comes to weight loss and health there are a number of factors involved. Obviously exercise and activity is a big deal but that alone is not enough to create a healthy lifestyle unless a healthy diet is added as well. Fortunately it isn't terribly difficult to start a healthy diet as long as you are motivated enough to make it happen.
The first step is to actually start planning out meals and making healthier decisions. All too often people just randomly buy things at the grocery store and often end up with unhealthy choices; this makes it very difficult to start eating healthier. Sit down one day and plan out breakfast, lunch, and dinner for the next week or two, that way when you go to the grocery store you can buy the healthy foods you've planned and nothing that is unnecessary. Not only will this help with getting healthier, it'll also save some money.
While planning out your meals it is important to consider a few things, calories, fat, sugar, and processed foods are important to keep an eye out for. Fortunately it is actually pretty easy to avoid these as long as you buy fresh foods, plenty of fruits and vegetables, and homemade meals. Unfortunately for many people the difficult part is actually coming up with the correct portion size because even the healthiest of foods can make you fat if you eat too much. Portion size should be enough to fill you up without being too much, but also remember that much of your portion should be fruits and vegetables, or things like rice that aren't terribly high in fat.
Beverages are something many people overlook that can really make a big difference in a healthy lifestyle as well. Sodas are incredibly high in calories and sugar, so cutting down on the frequency you drink them or even eliminating them entirely is a very good idea. It is usually fairly simple to reduce your intake of sugary beverages as long as they're not easily accessible and in the long run it really can make a big difference. Try substituting some healthier drinks like low calorie teas, or just water, and you'll be amazed how much it helps. The amount of water you drink in a day is also worth considering because it can make a big impact on everything. Staying hydrated will help with any kind of exercise routine you are on, plus it'll keep you from feeling nearly as hungry, which will cut down on your portion sizes substantially.