Are popular diets more harmful than good?

The emphasis on healthy eating is so in these days, that it's achieved trend status. Almost all of us know people who're busy targeting their goal weight, hitting the gym and living a more all-rounded lifestyle.
However, eating healthy or losing weight doesn't involve just quick and temporary solutions. Rapid weight loss is usually followed by equally quicker weight gain, and it can also lead to dangerous health outcomes.
Some of the common modern diets or eating lifestyles that people who are hungry for results often turn include the Atkins Diet, which recommends a high fat and protein diet and minimal intake of carbohydrates and sugar.
Other regimens include the opposite of Atkins, like the vegan diet that only allows the individual to consume whatever he or she wants to, as long as it has no animal products in it, including meat, eggs, milk or even honey.
Vegans turn to fruits and vegetables, as well as beans, seeds and grains for consumption. Regular cow's milk is swapped for other alternatives, such as almond, coconut or soy milks. Another popular diet that many are turning to is the gluten-free diet, popular with those who have wheat and gluten allergies, including sufferers of celiac disease. However, it's a hit with many who have no allergies to gluten or wheat at all.
Popular diets can offer quick weight loss results, but health and medical experts told Khaleej Times that following strict dietary plans that relies solely on a specific food intake, while avoiding other food groups, could eventually lead to severe and lifelong health problems, including anaemia, heart disease and cancer.