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how many?

I'm 17. and my school gonna start in 16th sept. How many kilograms can i lost till this time?
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Your total daily energy expenditure (TDEE) is the total number of calories you burn in one day, and is found by adding your resting metabolic rate (RMR) to the number of calories you burn through exercise. For the average person, RMR is 1.2 times the basal metabolic rate (BMR), which is the number of calories you would burn if you stayed in bed all day. Therefore, if you are sedentary, your RMR is the same as your TDEE; however, if you are active to any degree, your TDEE is more than your RMR by the number of calories you burn through activity. To lose weight, you need to eat less than your TDEE, but no less than 80% of your TDEE (as eating less than 80% of your TDEE can cause you to go into starvation mode, slowing down your metabolism and causing undesirable symptoms). Also, because you are under the age of 20, you should not cut down to less than your RMR without the consultation and guidance of a doctor. In fact, it is recommended that you consult a doctor if you are planning on eating less than you are used to in order to lose weight while still under the age of 20. However, if you decide to increase your activity level in order to lose weight, that is fine as long as you don't have any health problems; however, if you have any health problems, you should consult a doctor before increasing your activity level. As far as exercise is concerned, cardiorespiratory exercises (such as walking, running, etc.) are best for weight loss. If you choose muscle building exercises (weightlifting or bodyweight exercises), the calories you burn will not translate to weight lost; but rather, fat mass transferred to muscle mass. Here is how much weight is maximally safe to lose at various TDEEs between now and September 16 (27 days), as long as muscle building exercises are not involved (If muscle building exercises are involved, subtract muscle mass gained from this value):

TDEE → maximum weight loss lb (kg) [minimum calorie intake]
1500 Cal → 2.3 lb (1.0 kg) [1200 Cal]
1600 Cal → 2.5 lb (1.1 kg) [1280 Cal]
1700 Cal → 2.6 lb (1.2 kg) [1360 Cal]
1800 Cal → 2.8 lb (1.3 kg) [1440 Cal]
1900 Cal → 2.9 lb (1.3 kg) [1520 Cal]
2000 Cal → 3.1 lb (1.4 kg) [1600 Cal]
2100 Cal → 3.2 lb (1.5 kg) [1680 Cal]
2200 Cal → 3.4 lb (1.5 kg) [1760 Cal]
2300 Cal → 3.5 lb (1.6 kg) [1840 Cal]
2400 Cal → 3.7 lb (1.7 kg) [1920 Cal]
2500 Cal → 3.9 lb (1.7 kg) [2000 Cal]
2600 Cal → 4.0 lb (1.8 kg) [2080 Cal]
2700 Cal → 4.2 lb (1.9 kg) [2160 Cal]
2800 Cal → 4.3 lb (2.0 kg) [2240 Cal]
2900 Cal → 4.5 lb (2.0 kg) [2320 Cal]
3000 Cal → 4.6 lb (2.1 kg) [2400 Cal]
3100 Cal → 4.8 lb (2.2 kg) [2480 Cal]
3200 Cal → 4.9 lb (2.2 kg) [2560 Cal]
3300 Cal → 5.1 lb (2.3 kg) [2640 Cal]
3400 Cal → 5.2 lb (2.4 kg) [2720 Cal]
3500 Cal → 5.4 lb (2.4 kg) [2800 Cal]
3600 Cal → 5.6 lb (2.5 kg) [2880 Cal]
3700 Cal → 5.7 lb (2.6 kg) [2960 Cal]
3800 Cal → 5.9 lb (2.7 kg) [3040 Cal]
3900 Cal → 6.0 lb (2.7 kg) [3120 Cal]
4000 Cal → 6.2 lb (2.8 kg) [3200 Cal]
4100 Cal → 6.3 lb (2.9 kg) [3280 Cal]
4200 Cal → 6.5 lb (2.9 kg) [3360 Cal]
4300 Cal → 6.6 lb (3.0 kg) [3440 Cal]
4400 Cal → 6.8 lb (3.1 kg) [3520 Cal]
4500 Cal → 6.9 lb (3.1 kg) [3600 Cal]
4600 Cal → 7.1 lb (3.2 kg) [3680 Cal]
4700 Cal → 7.3 lb (3.3 kg) [3760 Cal]
4800 Cal → 7.4 lb (3.4 kg) [3840 Cal]
4900 Cal → 7.6 lb (3.4 kg) [3920 Cal]
5000 Cal → 7.7 lb (3.5 kg) [4000 Cal]
5100 Cal → 7.9 lb (3.6 kg) [4080 Cal]
5200 Cal → 8.0 lb (3.6 kg) [4160 Cal]
5300 Cal → 8.2 lb (3.7 kg) [4240 Cal]
5400 Cal → 8.3 lb (3.8 kg) [4320 Cal]
5500 Cal → 8.5 lb (3.8 kg) [4400 Cal]
5600 Cal → 8.6 lb (3.9 kg) [4480 Cal]
5700 Cal → 8.8 lb (4.0 kg) [4560 Cal]
5800 Cal → 8.9 lb (4.1 kg) [4640 Cal]
5900 Cal → 9.1 lb (4.1 kg) [4720 Cal]
6000 Cal → 9.3 lb (4.2 kg) [4800 Cal]
6100 Cal → 9.4 lb (4.3 kg) [4880 Cal]
6200 Cal → 9.6 lb (4.3 kg) [4960 Cal]
6300 Cal → 9.7 lb (4.4 kg) [5040 Cal]
6400 Cal → 9.9 lb (4.5 kg) [5120 Cal]
6500 Cal → 10.0 lb (4.5 kg) [5200 Cal]
6600 Cal → 10.2 lb (4.6 kg) [5280 Cal]
6700 Cal → 10.3 lb (4.7 kg) [5360 Cal]
6800 Cal → 10.5 lb (4.8 kg) [5440 Cal]
6900 Cal → 10.6 lb (4.8 kg) [5520 Cal]
7000 Cal → 10.8 lb (4.9 kg) [5600 Cal]
7100 Cal → 11.0 lb (5.0 kg) [5680 Cal]
7200 Cal → 11.1 lb (5.0 kg) [5760 Cal]
7300 Cal → 11.3 lb (5.1 kg) [5840 Cal]
7400 Cal → 11.4 lb (5.2 kg) [5920 Cal]
7500 Cal → 11.6 lb (5.2 kg) [6000 Cal]

A final note: Don't overexercise in an effort to reach the higher reference TDEE ranges; those are for ectomorphs, extremely fit individuals such as pro bodybuilders and marathon runners, and people of extreme size. Chances are, you are none of these, as ectomorphs are the ones who have a very hard time gaining weight, let alone avoiding weight loss, and would never ask for weight loss advice unless it was for a friend, relative, etc., most people are not fit enough to reach the higher reference ranges safely without an ectomorphic metabolism or extreme size, and very few people are big enough to reach the higher reference ranges based on size — you would likely have to be well over 300 kg to burn that many calories without being an ectomorph or extremely fit individual. Only exercise as much as you can handle; otherwise you risk injury, and don't reach a higher reference range than you can handle eating for; otherwise your efforts will be counterproductive, as you will reduce your BMR through starvation mode.
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