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Whether you like it or not, the different diets followed by most Indians across the country lack adequate nutrition.

Let me set the record straight: nutrition is different from diet. While diet is the sum of food consumed by a person, nutrition is, to oversimplify, the quality of the consumed diet. There are different types of diets, but not all of them are nutritionally adequate.
For example, a vegetarian diet lacks vitamin B12 and omega-3 fatty acids, which are derived from animal products. A vegan diet lacks vitamin D and calcium, which are, again, mostly derived from animal and dairy sources. To lead a healthy life, a person needs to consume a diet that provides for food energy in …