The invention provides methods for increasing resting metabolic rate, reducing waist circumference, and weight control by administering a composition comprising dietary fiber, phenylalanine, tyrosine, tea blend, caffeine, and Lycium plants or Lycium plant extract preparations to the subject. The invention also provides a food or dietary supplement formulation which contains dietary fiber, phenylalanine, tyrosine, tea blend, caffeine, and Lycium plants or Lycium plant extract preparations.