A lot of weight loss herbs are stimulatory. Some athletes have even experimented with these to give them more energy during their competitions. If it is really necessary consult your doctor first. Fruit is detoxifying and you can eat as much of it as you want. You will lose a lot of weight if you cut down on other nutrition and replace them by fruit.
Some people feel that salt, pepper, and some spices can be stimulating.
Red Meat People feel good and strong right after the consumption of red meat. This is a bit strange because the energy of meat consists of proteins and they take 4 - 6 hours to digest. Therefore the immediate effect must be a stimulant. This effect can be caused by the stimulating elements the meat contains. A well known theory is that when animals are being killed, the animals know that it's about to happen.