Hi Liberdade - I think you're extremely smart (obviously, you're going for your PhD!) to focus on developing healthy habits. Everything will follow from that.
One of my sons went to University of Durham for a year. One of his friends got his PhD in biochemistry at Bath - he's been working here in the US on a grant for the last couple of years.
Are you starting up your exercise again? Very important, IMO, for keeping your energy level and metabolism up.
Age 61, Height 5'9"
March 2010 145 lbs, Jan 2013 173 lbs
1st Goal 145 lbs 5/25
New goal 140