Both yet and nevertheless express the same idea as “However” in paragraph 2.

Fad diets are known to be a source of potential harm to the individual. In addition, they may be ultimately responsible for worsening the obesity issue, doctors warned. If we want to avoid a hugely obese nation by 2050, we should inform the population about the deficiencies of these diets. Moreover, doctors claim that some pathological eating disorders such as anorexia and bulimia are fueled by ruthless promotion of unhealthy diets and foods.

Never before has there been such a proliferation of different regimes available, from the raw food diet to the Hollywood grapefruit diet. Several of these diets lasted for just a couple of months. One of the most popular is still the Atkins diet. However, only 2 per cent of women believe that it is good for their health. The diet, which cuts out almost all carbohydrates, was first introduced by Robert Atkins in the 1970s, but it recently enjoyed a clear resurgence in popularity, selling millions of books worldwide.

Although these food fads are often based on a scientific theory, the nutritional content of the diets has rarely been tested because they are so complex.