low gi carbs = good
high gi carbs = bad
examples:
low = sweetpotatoes, yams, beans, whole wheat breads, pasta, brown rice, barley, lentils, oats etc...
high = sugars, anything that comes from a box, white rice, cereals, white bread etc...
To find out how many carbs you need, first find out how many cals you need, then protein, and fats... protein should normally be around 1-1.5g per lb, fats around .4 per lb, and the rest of your cals should come from carbs
so...
If you eat say 2000 cals and you are say 150lbs first you should consume 150-200g protein, and around 50-60g fats. Now thats 150-200x4=600-800 cals, and 50-60x9=450-540 cals ... so thats a total of anywhere from 1050-1340 cals, the remaining 950-660 cals should come from carbs, so you would need around 240-155g carbs, if your hoping to lose weight keep to the lower end of the carbs and the higher protien, to gain, you'd want more carbs. Use this formula once you've figured out your caloric needs.
BTW what are your stats : age height weight bf etc?



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