Hi and welcome. Its based on calories for you height, weight and other factors but below are some guide lines:
14-16 years, sedentary level 2300, low active level 2700, active level 3100
17-18 years, sedentary level 2450, low active level 2900, active level 3300
19-30 years, sedentary level 2500, low active level 2700, active level 3000
31-50 years, sedentary level 2350, low active level 2600, active level 2900are .
Your question " How much food should I eat a day??? " is a good one. If you live in Canada, a good place to start for your answer is the Canadian Food Guide. The guide is helpful because it tells you how much food you can have from the various food groups per day. I've heard that it is important to eat some protein at every meal. Try and lower your consumption of sugar and salt. You should consult your family doctor before you begin any new food plan. If you're trying to loose weight, I don't know if you are, or if you're trying to gain weight, perhaps your doctor can give you a referral to a dietician. I hope my suggestions have been helpful.
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