if it's just for quick, but not long term then low carb, Atkins diets are the best. But they are not great for long term because you can feel quickly deprived. But, you get results fast, and if you are looking to lose 5-10 pounds fast that's a "good" way to start.

This diet plan is excellent. I've lost 15 lbs so far in 2 weeks. Started at 176 and currently159. Went from size 16 to 12. www.bellaviadiet.com
Best Wishes

for quick and healthy weight loss the shapeworks is the best by a long way. if losing some pounds of any description and inches is what you want then I would suggest you use a diet that is all natural and is rich in protein and vitamins, which is what the FDA recommends. I used a protein based diet after a friend who had lost a lot of weight with this recommended it to me. All the way through you feel great and energized, you also get great coaching and support along the way. The people are very friendly and gave me lots of great advice. I needed to lose 40 pounds and I did so with no problems. The products really work and you feel great whilst losing weight. I lost all my weight in less than four months and they have helped me to keep it off. I would definitely recommend using them. My sister did this also and lost 76 pounds in five months (She works out, I don???t). There is no pressure and they will even send you a load of free samples so you can try before you buy. The samples were the thing that initially convinced me that this was the right diet for me. You also a get a free complete health consultation with the samples, I just paid the postage and handling, but for what I got it was well worth it. You just go to www.myhealthabc.com to register your details to get the free samples and the free advice etc and then they just call you up and ask you a few questions. It was so easy. Their main site is www.myhealthabcmall.com and you can see all the products and packages and order from their. Its nice to have contact with real people who care about you losing weight and improving your health. I am in better health now than I have ever been thanks to these products and I know that I will continue to keep the weight off with the help I have received. I hope this helps.

Diet wise? the best way to lose a lot of weight fast - is to do no carbs/atkins - I know people who lose 10-15 pounds their first 2-3 weeks, but then it levels off, and if you do end up eating carbs again the weight pretty much comes back on.
Best do eat a well balanced diet, if you do eat carbs, eat complex ones - like whole grains. Try to cut out junk food and sugary drinks.

Best for quick: Atkins
Best for life: Bob Greene's Best Life Diet