lisab said:Keep in mind that muscle is denser than fat.
Also in that study they didn't follow any particular diet, so maybe we can say exercise alone isn't enough for some people.
lisab said:Keep in mind that muscle is denser than fat.
The article cites a study that followed overweight women and found no correlation between amount of exercise and weight loss. OK, but what about body composition changes? I can't believe that wasn't measured. The women who exercised most may have gotten a lot smaller, but as they exchanged fat for muscle, their weight may not have changed.
Also in that study they didn't follow any particular diet, so maybe we can say exercise alone isn't enough for some people.
But in my personal experience, when I get injured and can't exercise, I gain weight. When I heal and start exercising again, I lose the weight. So for me, exercise certainly correlates to weight loss.
moose said:I know many people who eat several donuts and feel good about it because they worked out that day. With that mindset of course you're going to gain weight!
thomasxc said:perhaps exercise stimulates our hunger. but for me (i am a competitive runner) finishing a long and/or hard workout never really seems to make me more hungry than i was before (because i have to fast several hours before running.)
moose said:In general it is much easier to get rid of calories by making cuts in your diet than by burning them off (obviously a combination is best, but this is a general statement). The effort it takes to burn 500 calories vs eating that much is not matched, so many people have a misconception that they worked SO HARD that they can eat at least that much.
thomasxc said:perhaps exercise stimulates our hunger. but for me (i am a competitive runner) finishing a long and/or hard workout never really seems to make me more hungry than i was before (because i have to fast several hours before running.)
russ_watters said:The article didn't say how tall the guy was - maybe 163 lb is pretty lean and he just has a little bit of belly fat because he only does cario and never does abds?
junglebeast said:This discussion reminds me of an amusing memory on my first day as an undergraduate. After moving into my dorm there wasn't anyone to talk to and I didn't want to sit around bored so I randomly decided to go on a long exploration run. After about 3 hours I found myself out in the middle of nowhere in the woods, particularly starving and exhausted...so when I ran into a corn field, that corn looked irresistible. I tried to eat some of it it was the starchiest, nastiest thing I had ever put into my mouth!
Back when I used to run hardcore, after running I would often treat myself to a huge root beer float that was about 60% Edy's vanilla ice cream and 40% Barq's root beer (let me tell you...there is no better combination. Something about this combination causes the ice cream to instantly develop a 2mm thick hard caramelized crust as soon as it is immersed into the root beer that is to die for). Anyway, it didn't affect my weight, as no amount of exercise, eating, working out, not working out, or lifestyle changes has ever made my weight fluctuate by more than about 2 pounds in the past 10 years...
turbo-1 said:Not only that - when I wanted to donate blood, the Red Cross staffers made me see a supervisor after the initial screenings because they said my rest pulse rate was "too low". My BP was normal, but I had to convince the supervisor that my pulse rate was low simply because of the heavy free-weight work-outs.
The study has limitations because the sample is limited to sedentary, overweight or obese, postmenopausal women with elevated blood pressure. Thus, we do not know if the results will apply to other women or men. However, the study sample is a group that is likely to benefit from exercise training and represents a sizeable proportion, probably a majority, of U.S. women in the age range of 45 to 75 years. Further the study could have benefitted from a more rigorous and sensitive measure of energy intake. The food frequency questionnaire utilized in DREW prevented us from being able to definitively demonstrate that the observed compensation is the result of an increase in energy intake. However, it should be reiterated that examining compensation was not the a priori goal of DREW. The exercise training intensity was moderate and while this makes for good public health and clinical applicability, it is possible that higher levels of training intensity might produce different results in regard to compensation and changes in waist circumference.
In this study of previously sedentary, overweight or obese, postmenopausal women we observed no difference in the actual and predicted weight loss with 4 and 8 KKW of exercise (72 and 136 minutes respectively), while the 12 KKW (194 minutes) produced only about half of the predicted weight loss. We need to gain a better understanding of the mechanisms responsible for this exercise dose dependent phenomenon and develop strategies to identify and treat potential compensators.
thomasxc said:i envy a person with a 30 bpm heart rate. after almost five years of competitive running, i can't get mine under 50.dang.
Protein need makes us obese
Tuesday, 11 August 2009
Massey University
A Massey scientist’s study showing spider monkeys will overeat fat and carbohydrate-rich foods as a way of regulating protein intake has shed light on why humans become obese.
Nutritional ecologist Professor David Raubenheimer’s just-published collaborative study with international colleagues found the Bolivian rainforest spider monkey regulates protein intake by eating greater quantities of low protein/high carbohydrate foods when protein-rich foods are not available.
“This is interesting because our experiments show that humans do the same,” says Professor Raubenheimer from the University's Institute of Natural Sciences at Albany. The consequence is the current obesity epidemic.
Obes Rev. 2005 May;6(2):133-42.Click here to read Links
Obesity: the protein leverage hypothesis.
Simpson SJ, Raubenheimer D.
Department of Zoology and University Museum of Natural History, University of Oxford, South Parks Road, Oxford OX1 3PS, UK. stephen.simpson@zoo.ox.ac.uk
The obesity epidemic is among the greatest public health challenges facing the modern world. Regarding dietary causes, most emphasis has been on changing patterns of fat and carbohydrate consumption. In contrast, the role of protein has largely been ignored, because (i) it typically comprises only approximately 15% of dietary energy, and (ii) protein intake has remained near constant within and across populations throughout the development of the obesity epidemic. We show that, paradoxically, these are precisely the two conditions that potentially provide protein with the leverage both to drive the obesity epidemic through its effects on food intake, and perhaps to assuage it. We formalize this hypothesis in a mathematical model. Some supporting epidemiological, experimental and animal data are presented, and predictions are made for future testing.
PMID: 15836464 [PubMed - indexed for MEDLINE]
Behavioral Ecology Advance Access originally published online on May 19, 2009
Behavioral Ecology 2009 20(4):685-690; doi:10.1093/beheco/arp021
Protein content of diets dictates the daily energy intake of a free-ranging primate
Annika M. Feltona,b, Adam Feltona,b, David Raubenheimerc,d, Stephen J. Simpsone, William J. Foleyf, Jeff T. Wooda, Ian R. Wallisf and David B. Lindenmayera
a Fenner School of Environment and Society, The Australian National University, Canberra ACT 0200, Australia b Institituto Boliviano de Investigación Forestal, PO Box 6204, Santa Cruz de la Sierra, Bolivia c Institute of Natural Sciences, Massey University, Albany, Private Bag 102 904, Auckland, New Zealand d New Zealand Institute for Advanced Study, Massey University, Albany, Private Bag 102 904, Auckland, New Zealand e School of Biological Sciences, University of Sydney, Sydney NSW 2006, Australia f School of Botany and Zoology, The Australian National University, Canberra ACT 0200, Australia
Address correspondence to A.M. Felton. E-mail: annika.felton@anu.edu.au. A. Felton is now at the Southern Swedish Forest Research Center, Swedish University of Agricultural Sciences, 230 53 Alnarp, Sweden.
Received 3 September 2008; revised 6 November 2008; accepted 10 November 2008.
ABSTRACT
An important goal in nutritional ecology is to understand what governs the diet selection of free-living animals. Relevant information is however scarce because of the considerable challenges of collecting and interpreting such data. Here we use recent advances in nutritional theory to analyze data on food selection and nutrient intake by wild spider monkeys (Ateles chamek). We show that hypotheses traditionally used to explain vertebrate diet selection, such as energy or protein maximization, or avoidance of plant secondary metabolites, cannot explain the observed pattern of nutrient intake. Instead, spider monkeys maintained a stable daily protein intake but allowed total energy intake to vary as a function of the composition of available food items. A similar "protein-leverage effect" has been reported in humans for whom it appears to play a role in the development of obesity.
Key words: Ateles chamek, nutrient balancing, nutritional ecology, primates, protein.
I'm lucky that the Red Cross ladies measured my pulse as soon as I took a brisk 1/4 mile walk across the mill compound, because it was almost 60 bpm. If I had had to sit and wait for a while for the screening, it would have been down around 50 bpm or perhaps a bit lower. My workout partner and I did free-weight circuit-training, and except when we had to spot each other for heavy lifts (benches and squats mostly), we were lifting almost continuously for our 2-hour workouts. There were no "machines" at that gym apart from a couple of pieces with pin-selectable weights that let people do heavy lifts without a spotter. My friends' daughter sometimes joined us in workouts, and she was a brutal motivator. She was several times the world junior and later senior power-lifting champion. She would train with 450-500# squats and far exceeded that in competition.junglebeast said:I think low 50's is pretty impressive too. But what distance do you run? My father was an ultra distance runner, and set several world records in the 24 hour run, which requires spending a large portion of every day running as practice, and that probably causes the heart rate to naturally slow down so that it's only going 60-70 BPM when you're running, which would cause the resting rate to be far lower.
I suppose it depends on wether you want to look thin and be healthy or you care more about being compared to a platinum cylinder in Parislisab said:Keep in mind that muscle is denser than fat.
OK, but what about body composition changes? I can't believe that wasn't measured. The women who exercised most may have gotten a lot smaller, but as they exchanged fat for muscle, their weight may not have changed.
