Because you may tend to do things to the extreme (dieting, exercise etc) it could be a good idea to set limits for yourself.
For example: find the number of calories you need to maintain your weight (eg 1800 cal; there are calculators online) and stick to that number every day. Make sure the food you eat is nutritious and healthy, based around 3 meals and two snacks if you prefer.
As for exercise, also set a limit. Once your knee is better, stick to a routine of for example 30 - 40 min. of cardio 5 times a week, plus 2 or 3 weight training sessions a week, maybe 30 min. each. You could also vary your types of cardio exercise to prevent injuries/repetitive strains - not only running, but also walking or swimming, elliptical or cycling.
That way you won't be risking overexercising (and injuries or burnout) or undereating.View Thread
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