A change in diet can be stressful for you and your body and one common element neglected is hydration.
Not surprisingly the body works better when you are hydrated so just because you are reducing your food intake don't reduce your liquid intake. Just to make it very clear, by liquid I mean water.
I've been in a training course all week and haven't been drinking any where near enough water. ...rookie mistake!
Current weight: 70.5kg
Goal weight: 65kg
Goal date: March 2014
Start weight: 71kg
Total gain/loss: -0.5kg