One site that has a lot of information is www.getfitgetright.org. Slim fast is another good diet that offers the potential to lose seven pounds in seven days.
You can find information about diets that work from magazines or on the Internet. Fitness Magazine is a good magazine you can use for information on diets that work. MyFitnessPal is a good website where you can find out information about diets as well.
In general, most diets will only work if one cuts down on calories and combines it with exercise. Fast diets will be the same. Those who follow it swear by it, but results will vary.
Diets aren't for everyone, and different diets can work better for different people than others. Counting calories is one that many have success with.
Some diets that would work fast are called crash diets. This means that you would reduce your calories by only eating a real meal like once a day. You would also exercise more than normal.
Many diets are fast, but 340 is a lot. I would recommend to get professional help whether medically or athletically, from surgeries to work out camps they can help you out.
No, crash diets are terrible. Crash diets are unhealthy and can really hurt you if you are not careful. You should reach weight loss goals at a reasonable pace.
a good website would be www.low-caloriediet.com/ as it is all about low calorie diets and what they are and how they work and if they would work for you.
The best diets that work the good and last a long time are the ones that you can stick to for a lifetime. That is healthy eating and exercise. But for fad diets you could try a cleanse diet, those you lose weight fast but it won't stay off in the long run with out changing your habits.
A lot of the lose weight fast diets are scams. To lose weight you will need to change the foods you eat, and get lots of water and exercise. www.webmd.com/diet
WebMD and the MayoClinic will have advice on diets that work. Also you primary care physician will have helpful information. Basically, you need to reduce the calories you take in daily and increase the amount you burn.
Juice diets for the main part do not work. Check out this site for some basic information on the concepts and how and if they work http://allaboutweightloss.org/weight-loss-diet/no-white-diet/
There are a number of websites that provide information about free diets online. These sites include eDiet, SparkPeople, NowLoss, SlimmingSolutions, and SPDiet.