40 lbs in less than 6 months represents a massive drop in your weight. Anytime you're losing more than 5lbs a month you're asking for trouble, especially when there isn't some kind of significant and readily identifiable reason for previous weight gain (e.g., hypothyroidism, limb injury, etc).
While sudden drops of weightloss right at the start of a major lifestyle change are pretty normal, if you continue at this rate you should talk to your doctor.
I disagree. Anything up to 2 lb per week is a reasonably healthy rate of weight loss, especially if you're quite overweight to start with. Losing 40 lb in six months is both perfectly healthy and a damn good achievement.
Agreed. I think 1 lb per week is more in line with the doctor recommended rate, but 2 lb per week is the threshold you're not supposed to cross. 8 lbs per month in 5 months is right at that. That is a damn good achievement.
I'm not saying it's not great, but it's not a sustainable rate of weight loss if your goal is to lose a lot of weight.
When I cut soda from my diet I lost 10lbs in a month. In a month! And then it tailed off and I was depressed because I couldn't sustain it, I had unreasonable expectations. And if you're losing 2lbs a week for a very long period of time, it can be an indicator of underlying medical issues.
I have to disagree. Most doctors will agree that losing up to two pounds per week for a healthy adult is acceptable and normal during the course of intensive exercise.
Much like matwood, I was ~205 at 6' with an athletic build. I wasn't overly fat, but hefty (ok, kinda fat). Running and working out six mornings/week and basketball in the evenings allowed me to drop 2 lbs/week, to a much leaner 165. Coincidentally, I had a doctor visit or two during that time and the doctors never expressed any concern over it.
Fortunately, and I believe this generally for healthy adults, you will reach a plateau. I did so at 165 and never fell below that, even when I increased my running, lifting and other recreational activity.
You can't sustain any weight loss no matter how little for the simple mathematical reason that body weight is nonnegative. I do agree that 2 lbs/week which is about 8000 calories, or about 3-4 days worth of calories, is a lot. For an average weight person. If you weigh a lot then it may be ok because you naturally burn more calories per day so 8000 calories may only be 2-3 days worth. You shouldn't look at the lbs/week figure but at how many percent fewer calories you're consuming than you need to sustain body weight.
At some point though you shouldn't want to lose anymore weight. Unless you start out really overweight, simply losing weight shouldn't be the goal anyways. Lowering BF% is a much better goal that reflects your overall body composition. I'm 6' 1" and almost 200lbs and weight wise I could be considered overweight, but my BF% was 11% the last time I had it checked and I've since gotten leaner.
In short, don't get depressed about the scale. Look in the mirror and keep making body composition changes.
Are you a doctor or otherwise qualified to make the above assertion? Not trying to be confrontational, but very tired of continually seeing people spout information they read somewhere as if it was written-in-stone-fact, even though they have no expertise in the given field.
While sudden drops of weightloss right at the start of a major lifestyle change are pretty normal, if you continue at this rate you should talk to your doctor.