Each month iVillage poses a different question to our Dream Team of experts. Here's what we asked this month: When going for professional help, what's a better buy, a personal trainer or a nutritionist? We asked our experts to weigh in with their points of view.

Lynn Grieger, RD, CDE Why not get double your money's worth and work with someone who's both a personal trainer and nutritionist? It's always best to work with someone who's certified so you're sure you're getting accurate and safe information. Look for a registered dietitian (RD) who specializes in areas that mesh with your goals, be they weight loss, increasing muscle mass or simply improving your overall health. An RD who's also certified through the American College of Sports Medicine (ACSM) or the National Strength and Conditioning Association (NSCA) would be the optimal choice.

If there isn't such a person in your area, decide which you need the most help with ‑- exercise or nutrition ‑- and look for a professional in that area. I often refer my clients to personal trainers when it becomes clear they've made progress in changing their food habits but are ready for more intensive exercise training ‑- and the trainers refer to me as well.

Liz Neporent, MA