New to fasting – opinions please

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  • Hi. I am 21 and I’ve just decided to start fasting, but I want to be sure I am doing it right and I’m not actually hurting myself, instead of getting the benefits I should.

    I am 8’6 stone and my height is 5’6, my BMI is 20.3, but it used to be 18 last year before I let myself go. My BMR is 1332.

    I have read that people have breakfast and tea (500kcal all together) usually on their fast days, however i find it easier to have something in the middle of the day.

    For example, yesterday was my normal eating day and I didn’t exercise and I had 1350 calories;
    – Two poached eggs on two slices of wholerain bread with 20g of avocado for breakfast
    – Chicken breast with 150g of veg for dinner
    – 100g of pulled chicken and some more veg for tea
    – 150 g cottage cheese, 1 apple, one nakd bar, 4 mixed grain crackers, 50g frozen pineapple inbetween meals as snacks throughout the day.

    Last night I had my last food (pineapple) at 9pm. Today is fast day therefore I haven’t eaten all morning until I broke my fast at 2pm. I have fasted 9pm – 2pm, so that is 17 hours. I broke it with 150g cottage cheese and 25g nuts, and that will be it for the rest of the day. I will have breakfast as normal tomorrow morning and I will probably have another fast day in two days.

    I wanted to get people’s opinions and see whether that is a healthy way of doing it and whether I will be getting benefits of it, mainly losing some weight and speeding my metabolism up. On fast days I drink 2L+ of water and a cup or two of decaf green tea.

    Also, do people work out on their fast days? I want to make sure I do not lose my muscle. This morning I actually did some cardio, just 20mins and my polar watch said I burned 175 calories, but although I haven’t eaten before or after, I take CLA + Green tea supplememt capsules, therefore I believe that CLA will help me keep my muscles whilst burning fat.

    I am not going to often work out on my fast days, I will make sure that fast days are my days off gym, however, I know there will be odd days when I will want to get some cardio in first thing in the morning.

    Finally, I want to make sure I eat enough on my normal days to make sure my body does not go into starvation mode after a while, I use polar watch when I work out and therefore it is pretty accurate with the calories burned, on normal days when I work out, apart from eating my usual 1330 BMR, should I also be eating back the calories Ihave burned at the gym? Ps. I have slim protein shake to drink after all my workouts.

    Looking forward to hearing your opinions, tips and stories.

    Thank you, K X

    Hi,
    I’ve used your age, weight and height and assumed that you are female and undertake moderate exercise. I used the calculator on this website and these are the results

    BMI 19
    BMR 1317
    TDEE 2272

    This indicates that you are not overweight.

    The calculation also means that apart from fast days you should be eating 2272 calories as it takes exercise and fast days into account.
    The TDEE on this site is a little generous, but you should be eating around 2000 calories on your non fast days, and not “eating back” calories used during exercise.

    You cannot speed up your metabolism as it is a measure of how many calories your body needs and the less you weigh the lower it will be.

    I hope this clarifies how to undertake this way of eating.

    I often go to the gym on fast days and don’t find it any more difficult than any other day.

    I’m on alternate day fasting and I eat only 100 kcals on fast days and a maximum of two meals plus alcohol on feed days. I’m doing just fine and the little weight I have to lose is slowly coming off.
    The less you eat, the more you lose. Unless you develop an eating disorder or take willpower to the extreme you’ll remain perfectly healthy.

    You will certainly not go into ‘starvation mode’ and you will not speed up your metabolism.

    Ignore whatever you think you’re losing through exercise.

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