The Vegetable-only Diet

What it involves:

As the name suggests, vegetables are the only thing that can be eaten as part of this diet plan.

Who follows it:

Victoria Beckham revealed that she used to exist on a diet that consisted only of vegetables. In 2007, she told Heat magazine (UK): "I began living on vegetables and nothing else." Katie Holmes was linked to a vegetable-only diet after giving birth to daughter Suri in 2006.

The bad points:

Eating only vegetables ignores other major food groups and isn't nutritionally balanced.

Expert view:

Mason says, "The vegetable-only diet is unhealthy because it lacks the other main food groups which are essential to a healthy balanced diet. We need protein to build new cells and repair damaged tissue. Without protein, the body cannot function well. Plant proteins such as from grains, cereals, fruits etc are all incomplete proteins and so require a supplementation. We need fat to provide us with energy, to help us absorb vitamins, to help us produce endorphins (the 'feel good' hormones), to give us glossy hair, healthy skin and nails and to help our brains function well. You would soon find your energy levels depleted, feeling tired, lethargic and lacking focus and drive. Not an easy diet to follow and lead a normal life -- just try eating out!"