It’s 10 AM Sunday and quite
frankly, I’d much prefer to be leisurely finishing my coffee after my blueberry
pancakes-topped with a dollop of vanilla yogurt and heated real maple syrup.
But Ludwig and Friedman’s Always Hungry?
Here’s Why piece in the NY Times today compelled me away from my plate.
Here’s where we agree—and disagree
Do you just eat bread for your meal? |
Agree: There are factors
outside of your control that may contribute to your size. Genetics and the
presence of fat cells exert their influence. Once you have gained to a higher
weight with an increase in fat cells, you will be fighting an uphill battle to
lose that weight and keep it off—without disordered behaviors. And it’s not your fault. For more on this see
Professor Lowe’s work on weight suppression and bulimia.
Agree: Metabolic rate slows
down with food restriction—that’s indisputable from the research. Obese
individuals who have undergone extreme low calorie diets will have a lower
metabolic rate as a result of the decrease in muscle mass that results,
compared to same weight controls who had not dieted. Less aggressive approaches
to dietary activity change tend to spare the muscle loss and help maintain
metabolic rate.
Before dieting... |
But the authors state that metabolic
rate also decreases with weight increase: “…factors in the environment have triggered
fat cells in our bodies to take in and store excessive amounts of glucose and
other calorie-rich compounds. Since fewer calories are available to fuel
metabolism, the brain tells the body to increase calorie intake (we feel
hungry) and save energy (our metabolism slows down).” Yet there appears to be
few examples of this cited in the scientific literature, with the exception of
a possible rare genetic mutation, not likely the cause of obesity in the
greater population.
And the temporary slowed metabolic rate seen
with weight loss has been demonstrated to be reversed with weight restoration
in the obese (albeit a small sample size studied) and more dramatically in those who are
underweight with anorexia, summarized well by Carrie Arnold in ED Bites. In practice we see dramatic increases
in metabolic rate—calories burned and required each day—with weight gain in anorexic
individuals at least until they have restored to their healthy state.
Agree: Insulin increases
nutrient uptake and in excess causes weight gain. And carbohydrate results in
an increase in insulin secretion.
Disagree: Ludwig and
Friedman’s leap that foods that increase insulin secretion should therefore be
reduced or avoided for weight management is faulty reasoning—unless there is a
documented underlying metabolic abnormality. A relatively small percentage of
the total population has PCOS or hyperinsulinemia—a faulty regulation of
insulin. For these individuals, addressing carbohydrate amount or glycemic load
(impact of a food on raising blood sugar) has a positive impact. But there’s no evidence that a low carbohydrate diet is any better at long-term weight
management than any other dietary intervention.
In addition, while individual
foods and their glycemic index—the amount they raise blood sugar (and therefore
subsequent insulin levels) may seem valuable, practically speaking they have
less impact. You see, we generally don’t
eat single nutrients like carbohydrate. Rather, we eat mixed meals, containing
protein, fat and carbohydrate. And in this combination, the impact on insulin
levels that even the white potato might have if eaten solo is minimized with
that piece of chicken and the added olive oil or nuts in the salad.
This banana chocolate pastry has plenty of fat to lower its glycemic load! (From Tartine Bakery, San Francisco) |
And did you know that many of
the villainized desserts have a minimal impact on insulin levels? Peanut
M&Ms aren’t much different than lentils (see glycemic load—the best measure
of blood sugar impact which considers portion) and cheesecake made in it’s full
fat recipe will no doubt come in quite low as well.
I don’t share this to promote
a diet full of low nutrient, processed foods. Rather, to make a point. Viewing
foods as good and bad will do nothing to help you manage your weight—nor your
mental health. In fact, there’s plenty of evidence that feeling deprived by
denying yourself foods you enjoy leads to rebound overeating.
The authors also state “what
if it’s not overeating that causes us to get fat but the process of getting
fatter that causes us to overeat? Unfortunately, I think they have oversimplified
their hypothesis.
Sure, having more fat cells
may contribute to our struggle if attempting to lose weight. But it’s not
simply a macronutrient issue. Being larger presents more challenges for being
active; larger individuals report being subjected to fat shaming while
exercising—presenting its own challenges.
Rebound binge eating
following starvation—think dieting—has been well documented as well. All or
nothing thinking—what I call the “what the heck effect” results in overeating when
you believe you’ve already blown it.
After... |
Our over-scheduled lives with
multiple competing needs don’t help us either. Multitasking while eating makes
us less aware of what we are consuming and contributes to overeating. And the
larger the containers or plates we are eating from, the more we will
over-consume (see Prof.Wansink's extensive work on this).
Time and money constraints
add flames to the fire—we take little time to plan, shop and eat mindfully. In
fact, our cognitive ability is compromised by these stressors and worsened when
we diet. Perceiving that we won’t have enough food to meet our wants or needs,
referred to as scarcity creates a range of secondary effects. Poor decision
making, impaired ability to organize and follow through and hyper-focusing on
the immediate benefits without considering the long term consequences of food
choices are well researched and described in the fascinating new book, Scarcity.
Unrealistic goals set by
national organizations and by ourselves adds to the problem. If 150 minutes
per week plus 2 days of muscle strengthening/wk is unattainable, why bother?
Further, the food industry
isn’t all bad. (And no, I am not a
paid consultant to any food company!) They are the ones who bring us the
convenience of precut and cleaned vegetables and canned, high fiber, low
glycemic legumes. They allow us the convenience of reheating frozen brown rice
and quick cook barley. And they have given us a range of milks in every fat
percentage we could ask for, and yogurts of every style—Greek and higher
protein, sweetened, full fat, real sugar, artificial sugar and no added sugar. But many of the choices remain ours.
So what’s the solution to our
climbing weights beyond a healthy range?
- Move away from dieting and that sense of scarcity.
- Set realistic goals for change—be it frequency of a home-cooked meal or a visit to the gym.
- Begin to work on behaviors; separate eating from distractions, and delay seconds (see older posts on this blog for help)
- Include a range of foods and nutrients. Include high fiber, whole grains and legumes, fruits and vegetables, nuts and healthy oils; protein-rich foods such as poultry and fish, and less frequently red meat; low fat milk and yogurt and modest amounts of cheese.
- As part of a balanced meal, by all means enjoy your rice, breads and pasta, too. And you know my stand on baked goods! All or nothing approaches to dietary change will get you nowhere.
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