: How to design a running program and diet plan for losing fat in a healthy manner? I have a specific fitness goal that I want to achieve, and I wanted to take the opinion of some Fitness.SE members to ensure that I'm going

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1. Measure up

First of all, if you're serious about your weight loss and subsequent bulking, you may consider buying a body fat caliper. You'll get much more precise values and you'll be able to measure progress more accurately. If you're not willing to spend the money or are not sure whether you can use a caliper, The other solution is having a professional measure you up before and after. You won't be able to see the progress, though, only the end result. Your gym should provide that service. Let me express doubt about the body fat you provided. You're relatively lightweight for your height, and a body fat that high is unusual for such BMI.

Then, you should use some web forms to calculate your dayly calories requirements. You can use several and average the results. The forms should ask for your age, height, weight, gender and level of activity. Try www.medindia.net/patients/calculators/CalorieResult.asp and www.active.com/fitness/calculators/calories.htm
2. Plan your calories deficit through diet...

Then you can start making plans on calories deficit. You should spend more than you eat. Bodybuilders in cutting phase often do carb cycles. The routines are varied, but they are often 3 or 4 days cycles with 1 day with plenty of carbs (say 200g of dry carbs, e.g. a 100g apple doesn't count as 100g of carbs), 1 day with somewhat less (say 100g) and one or two depletion days with 50g of carbs.

Keep your fat intake between 20 and 30% of total calories, saturated fat below 7% of total calories. Your fiber intake looks good.

Try to eat many smaller meals a day, with an even carb distribution. This will help provide a sustained flux of energy and avoid insulin spikes, wich promote fat storage unless after exercising. Go for the complex carbs with whole grains, starchs. Avoid sugars, soft drinks et al wich, again, provoke insulin spikes.

Often times the cutting phase include a cheat day instead of the say-200g-carbs day, during which you are allowed to eat anything in any quantity. This is an important motivational relief since the daily routine of a controlled diet quickly gets hard to follow. You can't physically eat enough in a day to do significant damage to your diet, so relax and enjoy. Just don't cheat more than once a week !

Since you don't work out yet, your protein intake can be 1 or 1,5g per kg of body mass per day. I'm not sure how the body fat percentage influences this, however.

Restrictive diets often lack nutrients. If you're planning to follow it during more than a few months, you may consider taking over-the-counter vitamins and minerals supplements. You may check your vitamin and mineral intake on nutritiondata.self.com/mynd/mytracking. Building the list takes some time, but you'll know what is going on.

3. ...and exercise

5km 3 times a week seems too low. With this amount, you're barely getting out of the "sedentary" category. Doing more cardio will probably reduce your lean mass too, which, as I understand, is not what you want. Which leads us to the next point:

Even if your goal is weight loss, you definitely should lift weights. Buidling lean mass actually helps loosing weight, since maintaining muscle requires more calories than maintaining fat. Lifting weight is also a nice way to burn calories. Just running might very well get absolutely boring. Bulking up will also help you feel better and look better, which is good motivation. Trust the professionals at your gym to come up with a nice and safe workout plan.

Try your best to calculate the calories you use during each cardio session and workout, then add the values to your daily calories requirements.

Notes

If you fear for your knees, which is a completely valid concern, you may consider switch to elliptical or bike for a start. They're safer.

Last point. Measuring sodium intake, and in fact all nutrients, is a complex and time consuming task. Read the nutritional facts, go on keeping logs and do your best !

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At the end of the day, calories in < calories out = weight loss. There is some mixed data about the amount of calories, and the textbook "3500 calories = 1 lb" is somewhat suspect according to more modern studies, and the way that different people react, but all the studies agree (Whether atkins, paleo, grapefruit, etc) that caloric deficit is the main factor.

For protein intake, the RDA is .8 grams per kilogram of bodyweight per day. So for your weight, theoretically 54.4 grams of protein should be sufficient. However, that is for a sedentary diet, the more active you are the more you need to bump that up to maintain/grow muscle. You should be safe staying around 1-1.5 g/kg per day. That's 408 calories of your 2000, or about 25%.

As far as the composition of the diet, I would emphasize the protein and healthy carbs such as fruits, veggies and grains as close to unrefined as you can get. Wheat bread (True wheat bread, not merely undyed white bread), quinoa, cous cous, things like this. Fats should be 10-20% of your diet in general, with an emphasis on the healthy, unsaturated fats.

For the exercise, the cardio is fine, but I would look at adding something like stronglifts 5x5 or similar to add a muscle building component, which will also help accelerate the fat loss as muscle burns more calories, and also tightens areas. I would recommend against this if you have plans for any kind of endurance competitions (such as 5k/10k running) as the extra muscle mass would work against you.

Lastly, I would address your fat rate. I would suspect that your bodyfat is probably less than the 23.6% that your handheld device is telling you. Bioelectric has an error rate in the range of +/- 5-10% depending on the model and algorithm used. I would test it against an underwater weighing, or a skin caliper test done by an experienced tester. While I carry extra muscle weight due to cycling, I am 5' 10.5", and at 170ish lbs (~77 kg), I am right around 10% bodyfat. I would tend to doubt that you are 14% more bodyfat than myself, at 20 lbs less weight.