Lemons for being healthy?

Tom Daley, the cute British diver, recommends to add half a lemon's worth of juice to some lukewarm water in the mornings, just after getting up and  before eating, to feel some amazing health benefits on:

• Immune system
• Cleansing
• Healthy skin
• Weight loss
• Energy boost

Seeing his body it seems to work, isn't it?

Thanks buddy!