This statement refers a survey conducted between 1976 and 1980. This does not mean they were deficient in vitamins or minerals. Dietary surveys that measure nutrient intake for a single day or even a few days, are not suitable for determining the overall quality of an individual's diet. Furthermore, adequate nutrient intake can be achieved with fewer than the recommended number of portions of fruits and vegetables. Others may try to eat right, but fall short because of today's busy lifestyles.
Most vegetarians have no difficulty designing an adequate diet.
Those who eat no animal products at all should supplement with vitamin B12. People who are lactose deficient and must limit their intake of dairy products should take calcium supplements. Most people who are dieting do not need vitamin supplements. Regardless, an individual decision about taking supplements should be based on an analysis of that person's diet. For most people, dietary improvement is more sensible than supplementation.