Yet research shows that older people may need more of certain key nutrients, such as B vitamins and calcium.

But we also know that certain nutrients may help as well.

Some tumors make chemicals that change the way the body uses certain nutrients.

Plants need certain nutrients in large quantities, which fertilisers provide.

Chances are, you've heard about recent research suggesting that certain nutrients can help delay or prevent eye problems and disease.

Animals that do not eat meat, for example, will have to get certain nutrients like protein from other foods.

Daily value shows the percentage of a certain nutrient in a food, based on a 2,000-calorie diet.

By now, it's common knowledge that certain nutrients help specific body parts work better.

Diets that lack variety can be deficient in certain nutrients.

Vegetarian diets were once thought to be lacking in certain nutrients.