How fast is too fast to lose weight?

For most of my life I have been moderatly overweight, perhaps 40-50 pounds above my “ideal” body weight. I’ve gone through periods of intermittent dieting and light excercise, and periods of deep depression in which I overeat and didn’t excercise; typically I’ve seen my weight swing up to 20 pounds up or down during these periods.

About two months ago I started taking Concerta to help with concentration and attention span. It’s helped a lot with my work performance and ability to stay on task. It’s also had the unexpected effect of greatly lowering my appetite. (It doesn’t help that I’m also on Wellbutrin, which also has apperite reduction as a side effect.) I still eat a normal breakfast and dinner, but either skip lunches or have only a small piece of fruit during the day, and I’ve stopped eating in-between-meal snacks entierly.

We’ve also had a stretch of beautiful weather here over the last few weeks, and I’ve been making a point to walk daily, getting half an hour to an hour of excercise a day. I’ve also started doing push-ups and sit-ups nightly.

I’ve weighed myself a few times over the last month, and I’ve noticed a suprising drop of weight. I haven’t been keeping records (but I’ll start doing do now), but I estimate I’ve lost at least 6 pounds in the last month, and at least 3 in the last week. This is a lot for me - usually I have to fight just to get my weight to drop a little.

Now, I feel healthier, and I’m fitting into my clothes better and down to the last hole on my belt. But I have to wonder if I’m in danger of causing myself health problems by losing weight too quickly.

Medical Dopers - at what point do I need to be concerned? How fast is too fast to lose weight? Is there anything I should be making sure to do to safeguard my health while dropping pounds?

First of all, congratulations to you on your recent improvements. Keep at it.

IANA nutrionalist, but here’s my take on it:

First of all, it depends on the kind of weight you are losing. Most likely, you’re burning off some of that extra fat you’ve been carrying around. It’s not unusual to lose quite a bit of weight in the beginning of a new exercise program, and if you’re 50 lbs overweight losing 6 lbs in a month, or even 3 in a week is nothing to be particularly concerned about. Just getting any exercise, especially muscles that haven’t been frequently used, is going to stimulate the ol’ metabolism and burn off some reserves if you aren’t feeding yourself enough to sustain your activity level. You’ll most likely plateau out once you’ve become accustomed to your new level of effort.

If you are losing water mass, it’s just temporary and either indicates that you need to drink more water or that you might have some kind of side effect from one of the drugs. (I don’t know about Concerta but IIRC Wellbutrin has diuretic side effects. I know when I took it I was always thirsty and always needing to take a leak.) You don’t really need to drink the 10-12 glasses of water sometimes recommended (you’ll get most of that in your daily diet anyway) but hey, drinking more water doesn’t hurt you, especially if you’re trying to exercise and burn off fat. It does help keep your kidneys healthy and flushed out.

If you’re losing muscle mass, then 6 lbs a month is a real problem. If this was the case you probably wouldn’t be feeling too good about walking, sit-ups, and push ups, though; you’d feel weaker, not healtier.

As with any change in lifestyle, excerise plan, diet, et cetera, you should go see a doctor and all that (or better yet a professional nutritionist, as most MDs are pretty ill-informed on nutrition), but unless your bloodwork comes in seriously abnormal I doubt he’s going to say anything discouraging at this point. The thing to avoid is the weight cycling that many people do, pogoing up and down the scale.

A few of random thoughts:

Eating a good breakfast and dinner is recommended, of course, and I don’t see any harm in your light (or no) lunch if you’re not hungry or not feeling ill effects. I see my cow-orkers bringing in or going out for huge lunches, then sit around all afternoon and get dopey 'cause they aren’t doing anything but sitting at desks or in meetings. If you think you need to consume more during the day, try eating a couple of snacks instead of lunch, or get a premixed smoothy like Odwalla or Naked (I like Boathouse Farms stuff but it’s expensive and may not be available in a store near you) and drink it at your desk (assuming you have a desk job) over the course of the day. You could also try drinking one of those canned drinks, like Ensure, but personally I think they taste nasty and I’d be afraid my coworkers would start putting “Depends” boxes on my desk, only most of them don’t have that much of a sense of humor.

Don’t get all worked up over the carbs fury that the Atkins-type people like to pound on, but do avoid the junk food (crisps and other Mylar-contained nutritional vacuums, soda/pop/coke, et cetera.) Eat a balanced diet; some vegetables, some grains, a moderate amount of protein in your favorite form, you know the drill. If you find you don’t have an appetite in the evening (and assuming you aren’t a teetotaller and it isn’t contraindicated by the drugs you’re taking) have a glass of wine or a beer with dinner, as alcohol stimulates the appetite. Also, try to eat shortly after exercising, while your body is still stimulated. (Though I find I don’t have much of an appetite right after running…it usually takes me 30 minutes or more before I can choke down a shake.)

Make sure you’re getting enough fluids, especially if you’re losing weight. I usually bring a litre bottle of tea to work with me and drink it over the day.

Keep on the exercise and try to come up with variations, or things you can do on days when it’s raining or foul out. I don’t generally care for gyms, but you might check out some near you, or look for something else you can do. It doesn’t just help with the fitness but will also keep your attitude up. (I suffer from depression myself, but I find that a nice hard run pushes the blackness back, if even only for a few hours.)

Good luck to you, and keep it up.

Stranger

IMO, the first ten pounds you lose don’t really count, since it’s probably “water weight”. You can lose the same amount just by dehydrating yourself for a day or two.

Once you drop more than ten, though, then you’re definitely burning fat and keeping the weight off. Not sure how much is too dangerous, but I’ve been losing around 1.5-2 pounds a week for about three months now (just shy of 30 lbs. lost all together as of today), and I haven’t felt any ill effects.

25 pounds in two weeks. That’s too fast.

That’s what happened when I became diabetic. I don’t recommend it.

However, 1-2 pounds a week of weight loss is fine, so long as you realize it’s happening, you’re trying to eat a balanced diet, and you’re getting a modicum of exercise. Good luck, and enjoy your health!

This is something I’ve also been worried about lately.

I’ve lost 28.5kg (63lbs) in the past 8 weeks, (I need to drop another 20kg to hit my ‘ideal’ weight).

I’ve done it with a daily energy intake of about 3500kJ (800 calories) and two 8km (5 mile) walks per day. I put an emphasis on protein, but I don’t ‘believe’ in Atkins.

I feel fine (except for sore legs :wink: ).

However, whenever I read about weight loss there’s always a suggested rate of about 1kg (2.2lbs) per week - but they don’t say why.

Obviously I’m well above that rate (at this point I’m still losing a kilogram every other day), so am I harming myself in some way that isn’t yet apparent, but that’s going to manifest itself at some later point?

I think the biggest reason this is suggested is that when you’re losing 1 - 2 lbs a week, you’re following a lifestyle that’s sustainable. You probably can’t continue to eat only 800 calories a day for ever. Well, I suppose you could, but you would be cranky as hell. :slight_smile:

(PS - congrats on the weight loss!)

Well, IANANutritionist, but I did take an intro nutrition course in university. My professor said that the reason she recommends a minimum daily calorie intake of 1,200 calories is because if you’re eating actual food, it’s almost impossible for that drastic a diet to be nutritionally adequate. By this she meant vitamins and minerals, not just calories.

There are a few doctor-supervised drastic weight loss programs where you only eat heavily-fortified shakes and whatnot, but this definitely isn’t a DIY thing.

Basically, in the long run on an 800 calorie diet, I’d be concerned about vitamin and mineral deficiencies. Also, personally I’d be concerned about your body composition and not just your weight. You say you’re eating a lot of protein, but if you test your body composition you can make sure you’re just losing fat-mass, and not lean body mass (muscle and bone) instead.

Yep, this is my main concern - but there’s no guarentee that if I ate 1200 calories it would help - (i.e. I could get another 400 calories out of bigger portions or a few pieces of fruit and completely miss a deficiency).

I’m savvy enough to look at the RDIs that are commonly listed on the side of products (i.e Vitamin A, Vitamin C, Calcium, Iron, etc) and I’m sure I’m at 100% RDI for most (maybe slightly deficient in Iron), but of course its the myriad of other nutrients that I’m worried about.

Diet is pretty much this:
6:00 am: Hi-LO cereal + Skim milk + Diet yoghurt or apple/banana/nectarine
12:00 noon: Wrap (Atkins\Subway\Empower) + Chicken, ham or tuna + Salad (plenty)
6:00 pm: Steamed vegetables (various and plenty)

Here’s the kicker - and I know this may make me unpopular :wink: - I have absolutely no problem with hunger, or will power. This strict regimen I have myself on just seems to remove food from my thought process - I just eat what I decided I will eat at the appropriate time, I’m finding it so easy that I’m thinking of going on wil one of those life-extending caloric-restricion diets after I reach my goal weight. :slight_smile:

Dropping your calorie count too low is not only unhealthy - your body’s starvation mechanisms will kick in and slow your metabolism down. At a certain point your fat loss will plateau, and if you stop the diet/exercise program you’ll just bounce back to your original weight. You’ll want to hit at least 1200 kcals, and two servings of fruit per day for the fructose to keep your liver converting T4 to T3.

I’d recommend that you read all the stickies here. Just about everyone who bodybuilds does it in cycles - there’s a bulking cycle, usually undertaken in the winter, and a cutting cycle, usually approaching summer so we can look good for the beach.

For a more scientific approach, consult the threads at the diet forum at Avant Labs. They’ve got quite a number of nutritionists, bodybuilding veterans and scientists in the crowd.

Count your calories. www.FitDay.com has an excellent archive of various foods and caloric value and will do all the addition for you. Registration is free.

Up calories to at least 1200 but adjust for BMR; google ‘basal metabolic rate calculation’ for instructions). Add more protein (skimmed cottage cheese, chicken breasts, fish) and two tablespoons of cold-pressed flax oil or fish oil

More meals, more frequently: you can simply half each one and take them in between. It’s inconvenient, I know, but it helps.

Forgot this very, very, very important bit: no one should go on a restrictive calorie diet without a proper multivitamin. Centrum is good.

Also, no carbs with fat. Insulin + lipids floating around = bad thing.

The weight you lose is never 100% fat, just like the weight you gain is never 100% muscle. That’s the large problem with very low-calorie diets: they burn muscle and other important tissue at too high a rate.

A 132 pound moderately active female needs 2000 calories to maintain her weight. If she dropped to an 800 calorie diet, she would still only lose 2.5 lbs per week. Since that is probably unhealthy, it makes sense to recommend 1-2 lbs/week max.

AndrewL, I lost 100 pounds in eight months, but I was under constant doctor’s and nutrionist’s supervision after a gastric by-pass.

Another time I lost weight very rapidly on a less than 500 calorie liquid diet for 6 months. I had no feelins of hunger and didn’t think about food. But if I had continued on that path, my electrolytes would have eventually gotten out of balance – or so I was told by the doctor. Once I returned to normal foods, I regained all I had lost and more.

After the by-pass surgery, I lost a total of 150 pounds, but regained 30 pounds over about four or five years time.

It was also medication which took my appetite away and released me from compulsive eating habits. I’ve lost twenty-one pounds over the last two or three years without effort. I don’t think about food very much. (Overall, I’m maintained a weightloss of 143 pounds for 7 years.)

If you are eating a nutritious diet with enough calories to sustain your activities and keep you healthy, then I wouldn’t worry too much about how much you are losing. (I’m not a doctor or nutritionist.) Behavior is more important than the number of pounds you gain or lose.

BTW, as your body firms up, you may at some pound gain a little. That’s okay. Those muscles can weigh a bit!

Congratulations on your healthy life style!

Thanks everyone. If I drop another 10 pounds at the same rate I’ll start to worry, but I suspect that I’ll be fine.

I haven’t been sticking to any kind of diet or nutrition plan, but I might look into that. The main thing that concerns me is the drop in appetite - I’m just not interested in food most of the time - and any possible vitamin deficiency or similar form of malnutrition.

I once lost 30 pounds in a week.

Of course, I was in intensive care at the time :smiley: