If it’s your muscles that are hungry, that is.
Lactic acid is a substance produced through the breakdown of glucose and pyruvate (an organic acid). When you work out, it can cause high levels of this lactic acid, causing a burning sensation or painful, sore muscles. I think about the times I’ve pushed my body to the limit, whether during an intense run, or some extreme body shaping class. Here’s a great site for more information:
Sometimes, the altitude you are working out at can contribute. When you are at higher altitudes, the availability of oxygen in the air is reduced, leading to a lactic build up in the muscles. This can cause muscle fatigue and the burning sensation. You might need to modify the intensity of the work out in order for you to continue exercising for longer periods of time.
So, what can you do about it?
Stay hydrated. The more you drink, the less likely you’ll feel the burn.
Work out more frequently. The more physically fit you are, the less glucose your body will need to burn and there will be less acid build up.
Build up to your intensity. Take smaller steps to reach towards your fitness goals.
STRETCH. Stretching after a work out helps to release lactic acid.
Eat foods that will help. Avocados. Bananas. Milk.
And know that it won’t last forever. Lactic acid in small amounts is not damaging to your body and may even have some beneficial effects on your metabolism.