Oh the topic of food and hydration. What foods are good for my practice? What foods aren't? What should should I be putting into my body? What shouldn't I? How much water should I be drinking? I could write forever about this, but I'll keep it simple. The best answer I can give you is: everybody and every body is different.
If you're practicing 3 - 7 times a week it's vital to keep consistent hydration throughout the day, during your practice, and after. It's recommended to drink approximately 2 liters of water before coming into the hot room. You're sweating.... A LOT, so replenishing your water intake and electrolytes are key.
- Coconut water or
- Nuun tablets etc. are great ways to help replenish them.
The foods we eat throughout the day factor into our practice significantly. Students tend to come to me after class and say they felt really dizzy, nauseous, or sick to their stomach. When asked what they consumed throughout the day they'll tell me: A couple cups of coffee, cake, ate right before coming, or nothing at all! Listen to those feelings your body gets during class, it's telling you something!
But no need to fear! Bikram Yoga will naturally change your diet. Eventually you'll want to start putting healthier things into your body because it'll effect your practice in a more positive way. Your body will become more sensitive to the foods you put into yourself too.
Once your practice starts to be more positive, once you start to feel good, those effects start to expand outside the room. It's a chain, leading from one good thing to the other. Just take it step by step. Listen to your body. Don't sweat it too much, but still sweat ;).