Turning into vegetarian need not be an overnight effort. One
could start to increase the consumption of carbohydrates and
fibres, so that stomach will get full easily, and hence lesser
desire for meat products. As a vegatarian, I can vouch for the
benefits of becoming one, became healthier is one. Of course, I'm
not saying a vegetarian will not fall ill, but without animal fats,
one does becomes "lighter".