I read up on Metabolic Typing from a variety of sources. It has been discredited. The science is unproven, untested, and some dietary advice based on MT is considered by medical experts to shorten lifespans. Although there are positive anecdotes by practitioners and recipients of MT dietary advice the same positive outcomes can occur for some people for anything - including tobacco smoking, alcohol abuse and self-flagellation.
No diet will work "today". Most of the initial short-term weight loss from fad diets is water, food bulk and muscle in addition to fat. Losing weight is a slow, long-term process, just as gaining weight was. It also requires a person to change their life and the way they think and feel about food. It's not easy, otherwise none of us would be fat.
One of the simplest ways to lose weight is to cut out most processed foods from our regular diet. Reduce intake of sugar, salt, fat and alcohol. Eat mostly plant-based foods. Eat a variety of foods in order to get a broad range of nutrients. Eat less. Exercise regularly so that muscle lost during weight-loss process is rebuilt.
And most importantly, nothing you do, including what I've outlined above, will actually work unless you eat less food energy (kilojoules) than your body needs. Weight-loss works by forcing the body to use up the energy stored as fat.
Finally - read the Australian Weightloss site articles (there's lots here). Read the forum stories, such as those in Personal Progress and Diet Talk. There are many success stories, some not so successful. But all contain valuable information.