On 1st January this year I weighed 75kg. I'm 1.78m tall. That's a BMI of about 23.7 - within the normal range, but certainly there's room to lose a few kilos.
The following calculator predicts a 34 second gain in a 10km race for every kilo I lose: http://www.runningforfitness.org/calc/diet/weighteffect. Minimum healthy BMI is 18.5, which is about 59kg for me. I'm not in any immediate danger of being too skinny!
My goal for the race in April is to be under 70kg, which was my weight when I set my last PB. If I go crazy and lose another 5kg that would translate to another 3 minutes on race day - worth considering as long as I don't mind temporarily sporting the skeletal look.
To lose a kilo I need a calorie deficit of about 7500. That's only about 100km of running, which I'll be doing every 2-3 weeks during my training. Getting under 70kg should be easy.
Another data point: in 2012 I lost 8kg in 6 months, basically just from running lots. A similar rate of weight loss this time around would put me right around 70kg.
So this goal sounds like a doddle - let's see if that's how it proves in practice.
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