Can metabolism increase suddenly?

Sounds like your giving in to temptation, I take it you mean 300-600 not 6000 calories, I do 2-3 hours cardio 1200 to 1800 calories 6-7 days a week and struggle to eat my net calories.

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Fair enough, any idea what could be going on I've increased my workouts from 2 x per week to 5x. is it just a case of my calorie allowance being too low. I'm 5'7 178 lb f?

It doesn't matter where the net calorie goal is for the day, because if you do more, you eat more.

so it should not be too low unless you are not following the program.

Your body could also being trying to make some improvements, which exercise has been known to do, and it wants some extra food for that. Body improvements rarely have weight loss as side effect, but gain.

Or, you've had several big meals/snacks of mainly carbs, got a slight blood sugar dip, and merely feel hungry from that.

Or your daily activity outside exercise increased too, and your base level of perhaps sedentary is indeed NOT correct.

I don't think your metabolism is increasing, I think your activity is just calling for more calories. 1600 calories a day to me is very low for the energy demands you are putting on your body.

Try something like this...

5'7"
178 lbs
Desired weight loss about 30lbs
Exercise 3-5 times per week

178 x 10 x 1.55 (activity factor) = 2759 - 900 (maximum deficit) = 1859 TDEE

I recommend you eat 1859 calories per day minimum.

As you get leaner reduce your deficit since you will have smaller fat stores to draw energy from. Multiply the weight you need to lose by 30 or, if you know your body fat level, figure out how much fat you are carrying and multiply that number by 30.

Hope this helps...

Indeed it does thanks very much for taking the time out to respond

I just looked into this last night. I think my net has been to low and in turn my body has stopped shrinking. So I am raising the bar and eating more to see if there is an improvement.

i think my metabolism has definately increased just put my hrm on for 20 mins at rest and have burned 50 kcals --!!

Did you do it before to have something to compare? Or you are basing the idea that is a high number compared to what?

Doesn't matter.

The formula for calculating a calorie burn from HR is based on the HR being in the aerobic range, from 90 to 150-170, for steady state, so same HR for 2-5 min, and aerobic, not anaerobic.

Since you were way under exercise level just resting, inflated calorie burn.

You can get an increased metabolism burn if you did a good strong lifting workout, for up to 24 hrs or longer, while body is repairing. But that would never show up with a higher HR, as your resting HR can more than take care of those needs.

Every woman I know has these "empty days" where it feels like you need to eat everything in site all day long. I've had many discussions with various friends about it. No one really agrees on why, but it's certainly not uncommon.

Pinterest is full of little jokes about it.

Why is it just women? Men have days like this too. I ate something like 5000 calories on Saturday and I was still hungry. It was like a bottomless pit. It happens once every few weeks for me. I just go with it and call it a refeed day.

Every woman I know has these "empty days" where it feels like you need to eat everything in site all day long. I've had many discussions with various friends about it. No one really agrees on why, but it's certainly not uncommon.

Pinterest is full of little jokes about it.

I agree with this. Some days I have no problem eating at my goal, but occasionally I am genuinely hungry and just can't seem to get enough food no matter what. Would love to know why so I can see it coming... :laugh:

Every woman I know has these "empty days" where it feels like you need to eat everything in site all day long. I've had many discussions with various friends about it. No one really agrees on why, but it's certainly not uncommon.

Pinterest is full of little jokes about it.

Why is it just women? Men have days like this too. I ate something like 5000 calories on Saturday and I was still hungry. It was like a bottomless pit. It happens once every few weeks for me. I just go with it and call it a refeed day.

I think it's just that pinterest is mainly used by women.

Every woman I know has these "empty days" where it feels like you need to eat everything in site all day long. I've had many discussions with various friends about it. No one really agrees on why, but it's certainly not uncommon.

Pinterest is full of little jokes about it.

Why is it just women? Men have days like this too. I ate something like 5000 calories on Saturday and I was still hungry. It was like a bottomless pit. It happens once every few weeks for me. I just go with it and call it a refeed day.

I'm with this guy. All sorts of psychological dramas kick in if you feel deprived. Easier just have a decent feed and then jump back on the wagon the next day.

I'm your height and weight twin and I work out about 5 days a week too (mostly weights, some yoga and cardio though).

I can't stick to a calorie goal of less than 1800 calories a day, and truthfully, the average over time is more like 1950ish, because of a few days here and there where I decide to eat something not on my plan. I also eat a lot of protein, adequate fat, fruits and veggies, and some starchy carbs (and two desserts) daily. It fuels my workouts just fine, and I have crushed several PRs during this time.

I've had my thyroid checked and it's fine. You might want to do yours too just to be sure, but I'm betting the answer lies in trying to eat a little bit more, more consistently. Check out my diary if you want; it's public.

I'm no expert, but you sound sugar addicted to me, try doing keto for a few weeks and stop your body craving the carb for energy, instead of using its stores

Really? That's your first post? *sigh*

If you have clinical depression, low carb can be a disaster. It can also be a big help. If you're well-managed, it's not worth the risk unless you already know it helps you. If you don't have clinical depression, and you want to try it, go nuts.