http://www.ncbi.nlm.nih.gov/pubmed/19633334
For men, in particular, it's more difficult and takes longer to become obese (due to hormones, I think). But the prevalence of obesity in prison involves the same issues, and the same obstacles, except physical activity is curtailed. It is allowed in a 'window of opportunity' for sports and jobs in prison don't necessarily involve much physical activity.
http://www.ncbi.nlm.nih.gov/pubmed/3984358
addresses women's weight gain in prison.
And is it any surprise that, when your food is a prison diet, and you are lucky if you get food 'from the outside,' you are at the mercy of the institutional food budget? Should these women have their diets examined because, it turns out, their cholesterol levels were lower than women outside prison?
http://www.ncbi.nlm.nih.gov/pubmed/17572105
Either I'm doing some really crappy searches or NCBI offers really very little data about how people gain weight in prison. Surprising, since they truly are a captive population for study.
The Gina Kolata article about gaining weight was interesting. But I found it much more interesting to look at an original study by Sims. It was an article about adipose tissue. I don't know if it is the particular study she cited but it was about lean men getting fat in prison.
What's easiest for me is just to use quotes. And cutting and pasting from a PDF is awkward, but I do it anyway... sorry, that's the way I do it.
Sims wrote:
'These observations in experimentally
induced obesity lend further credence to the concept
that adipose cell number may be altered only early
in life, and provide additional evidence for believing
that human obesity may be categorized according
to the cellular pattern of the adipose depot: early onset
obesity characterized by a hypercellular adipose mass and
adult onset a normocellular, hypertrophic tissue.
These conclusions should, however, be drawn with
great care, as the following considerations sugggest.
The changes in the current study were experimentally
and acutely induced, and the degree of obesity which resulted
was relatively mild. In spontaneous, lifelong human
obesity the abnormality is a more chronic one and
is usually more severe. It is possible that years of excessive
caloric intake in adult man leading to severe expansion
of the adipose depot could lead to changes in cell
number. Bray and Gallagher have reported a marked increase
in adipose cell number in an individual who became
obese as an adult as a result of a hypothalamic tumore
. Although Hirsch and Knittle report that
increased cell number is characteristic of the adipose depots
of patients with early onset obesity, there is some
increase in cell number in individuals whose obesity began
after age 20 . Thus, the question of when and,
if cell number becomes fixed remains unsettled. Additionally,
the current data indicate that there may be significant
differences in the size of adipose cells from one
subcutaneous site to another in nonobese individuals. In
this respect, the data differ from those of Hirsch and
Knittle but are consistent with the recent observations
of Goldrick and McLaughlin. The significance of
these findings lies in the fact that total adipose cell number
of the body is calculated on the basis of mean fat cell
size. Thus, until the size of adipose cells in all major fat
depots of the body as well as the relative contribution of
each depot to the total adipose tissue mass can be defined,
conclusions about differences in total adipose cell
number between individuals when calculated on the basis
of one, two, or even three subcutaneous sites should be
drawn with caution. This is particularly true in view of
the observation that in some individuals omental and
mesenteric fat cell size may differ considerably from
those in the subcutaneous depots.' The possibility that
intra-abdominal and subcutaneous fat depots are influenced
differently in obesity (spontaneous or experimentally
induced) has not been excluded by these studies.
An additional factor must be considered in interpreting
the present data as well as those of Hirsch: the sensitivity
of the method used for cell counting to detect very
small fat cells. It should be noted that according to
Hirsch and Knittle , in a few obese subjects who had
undergone extreme degrees of weight loss there was an
apparent reduction in total adipose cell number. The authors
believe this apparent reduction in cell number to
be artifactual since the method used for cell counting
depends on the lipid content per cell. Thus, cells containing
less than 0.01 /Ag of lipid might not be counted,
leading to an erroneous overestimation of mean cell size
and underestimation of total cell number. The apparent
reduction in cell number was found only in those individuals
with extremely small cells. Similarly, it is possible
that precursors of adipose cells containing little
lipid may exist in the adipose depot and thus not be measured
by the present techniques . If forced feeding
induced the formation of substantial numbers of these
precursor cells, an increase in cell number would go undetected.
Thus, although the current data taken together
with those of Hirsch and coworkers seem to support the
concept of a fixed number of adipose cells determined
early in life and the categorization of obesity into two
cellular types, for the above reasons some modification
may be necessary.
In spite of site-to-site variability in adipose cell size
the current data indicate that in these individuals the
lipid content per cell increased relatively uniformly over
the three sites examined. This is contrary to the gross
impression of earlier studies in experimentally induced
human obesity in which it appeared that the excess subcutaneous
fat was preferentially deposited in central
rather than peripheral depots . Such differences may
reflect differences in the total number of fat cells in a
given subcutaneous depot.
The data in the current study do not indicate that those
subjects who were fatter initially and who gained more
weight (A. C., N. H., B. H.) had either more cells or a
tendency towards a change in cell number when compared
to their leaner colleagues (R. P., P. W., S. L.,
L. M.).
The mean values for adipose cell size in the seven patients
of this study are below those reported by Hirsch
and Knittle using the same technique . One possible
explanation may lie in differences in body weight between
the two groups: individuals in the current study
weighing less. Hirsch and Knittle do not provide information
on the body weights of their nonobese group.
Other differences in technical procedures between the
two laboratories may play a role in these differences.
The present studies indicate that experimentally induced
obesity in adult humans is achieved primarily by
an increase in adipose cell size without a change in adipose
cell number. It is well recognized that weight gain
and increased adiposity under these conditions are associated
with the development of abnormalities of carbohydrate
and lipid metabolism. The mechanism(s) by
which this occurs is unknown. Studies currently in progress
in these laboratories are examining the role of factors
such as dietary intake and physical activity as well
as adipose cell size and insulin sensitivity in the development
of these metabolic abnormalities of obesity.'
My bold - I think that was the point of his study.
This was
'Experimental Obesity in Man: Cellular
Character of the Adipose Tissue
LESTER B. SALANS, EDWARD S. HORTON, and ETHAN A. H. SIMS
From the Department of Medicine, Dartmouth Hitchcock Medical Center,
Hanover, New Hampshire 03755, and the University of Vermont Medical
School, Burlington, Vermont 05041'
It appeared in 1968. Accessible from NCBI.
http://www.ncbi.nlm.nih.gov/pubmed/5721398
I don't agree with all that Gina Kolata thinks is implied by the studies, or even what the various researchers concluded. It does seem to me that size and number of adipose cells make a difference. Can you increase the number of adipose cells and then be stuck with dealing with that number (that can increase in size, each of them!) and how do you do that?
I'd have to spend more time reading the Kolata article and yet I already know that there are studies about adipose cell number. I'm just not going to delve into those waters right now!