Building on what to eat and how to be successful...
do this for life-changing results:

Eat clean:
No sugar, check all ingredients. No alcohol. No wheat - pasta, bread, cakes, pastry and biscuits. No fizzy drinks or squash.
Each meal (3 a day) made up of:
Eat a palm sized amount of protein.
Eat two or three fingers of fat.
Rest of your plate a rainbow of veg and a little fruit.

Move more.
Build towards CrossFit between 3 and 6 times a week
Walk more - fast
Sit less.

Sleep well.
7 hours at least - 8 hour preferable. Dark room. 

Get outside.
Spend time with trees to feel better about everything.