‘Pie hole’, colloquial for one’s mouth, is believed to have evolved in the USA in the 1980s from the British expression ‘cake hole’ (coined in the mid 20th century). Pie hole refers to a mouth, as in: Shut your pie hole or, in this case: Put less in your pie hole.

Wednesday, July 25, 2018

Are You Into Intermittent Fasting?

Intermittent fasting is a hot-button topic, and a popular trend in the weight-loss arena. A recent study shed some light on the science and efficacy of such a dietary pattern. So, should you fastidiously fast the fat away?

As usual, there's more to the story than the click-baity article titles fooling you with follies for fast fat loss.

Intermittent fasting is a broad term covering diets including: 
  • Start-stop eating where people fast completely for 24 hours once or twice a week
  • The 5:2 diet where participants choose one or two non-consecutive days and consume only ~500kcals on those days and eat normally on the other days
  • The 16/8 pattern where people eat only during an 8 hour window, the other 16 hours are fasted
This last pattern involving the 8 hour eating window is where we'll wander today.

A new study found that participants who followed this eating pattern for 12 weeks had the following results compared to those following their usual diets:
  • An approximate 3% loss of body weight
  • An approximate kcal deficit of 300kcal per day (hence the above weight loss)
  • Participants reduced their eating window on average by 3 hours (from 11 to 8 hours)
    • Though research shows only 15% of adults have an eating window <12 hours 
  • A significant decrease in systolic blood pressure 
A few other noteworthy mentions:
  • This study was performed with an obese population
    • Meaning results are not applicable to other populations (eg: normal-weight or overweight individuals) without more research
  • This diet pattern involved no calorie counting
    • A great thing considering counting calories is often inaccurate, time-consuming, not sustainable for a long period, and creates a preoccupation with food
  • The feeding window in this study was 10am-6pm
  • Participant adherence to this eating pattern was positive
    • Meaning this type of dietary pattern shows promise of being sustainable over a long period, compared to alternate-day fasting (like 5:2), or ridiculous diets like "no sugar" or "no chocolate" that cause rebound-like effects when dieters inevitably "fall off the wagon"
  • Compared to other forms of intermittent fasting, this period of time restriction produced a lower energy deficit (meaning less weight was lost) 
    • For example: emerging evidence shows alternate-day fasting produces a deficit of 25-30% of daily calories compared to the time-restricted window that produced ~20% deficit
    • The likely reason is that alternate-day fasting requires strict monitoring and calorie counting where time-restricted fasting does not, as the saying goes "work smarter, not harder"
  • Other cardiometabolic factors (eg: glucose control, insulin sensitivity, triglycerides, cholesterol levels) didn't reach statistically significant levels of improvement 
    • However, the obese population studied had baseline cardiometabolic markers within normal ranges. Therefore, it's quite possible that repeating this study in obese people whose markers are abnormal would see improvement
Lastly, we can't have a conversation about time-restricted eating, as exhibited in this study without mentioning the body clock (circadian rhythm). A previous Pie Hole article details the research on our internal rhythm and how it is impacted by the time of day we eat, drink, and sleep. The timing of food has flow-on effects that can alter metabolism and the microbiome. Research shows a shorter eating window (of <12 hours) helps improve sleep quality, weight loss, weight maintenance, and energy levels.

What are the take home messages?
  1. Shortening your eating window to <12 hours can have many health benefits including higher sleep quality, this in turn impacts metabolism and hormones related to hunger, thus weight
  2. Shortening your eating window is sustainable:
    • It doesn't require calorie counting or strict "dieting" which can lead to a preoccupation with food, increase the risk of disordered eating, and lead to weight regain
    • Long term sustainability means greater adherence to the eating pattern, less "falling off the bandwagon", more positive and long term results 
  3. Put less in your pie hole during a window of 12 (or less) hours per day

Thursday, May 17, 2018

Don't Forget to Exercise

You already know there are a multitude of benefits to exercising. You may not know quite the extent and reach of these benefits. Wait for it... Well, maybe run for it...

Several new studies investigated physical activity and it's relationship to cognition. As we get older, we tend to have more "senior moments" or "tip-of-the-tongue" moments where we can't quite remember something but we know we know it. Instead of flopping your fingers over the keyboard typing into Google, it's time to get those flabby arms 'a flapping!
One study found that healthy older adults have more of these "senior moments" compared with young adults. This may also happen to new mothers... Been there.
But seriously, here's a brief overview of several recent studies showing your brain's health is linked to exercise:
  • One study found physical activity intensity was associated with improved performance on several cognitive assessment tasks
  • Another study found that higher aerobic fitness levels decreased the probability of "senior moments" in healthy older adults
    • This study further demonstrated a link between aerobic fitness and language functioning in older adults
    • Perhaps a fit older person could write me a funny joke about hemorrhoids and steroids?
  • A study investigating adults with mild cognitive impairment found subjects receiving cognitive exercises, physical exercises, and music therapy had significantly improved levels of cognition compared to the control group (no intervention) whose cognitive status significantly worsened
    • Yes, that means the exercise/intervention group's mild cognitive impairment improved, while the no-exercise group's got worse
  • Another study found the duration of exercise (>1 hour/day) increased cortical thickness in various areas of the brain 
    • Thinning of these areas is associated with age-related deterioration and Alzheimer's Disease
    • Interestingly, frequency and intensity were not associated significantly with cortical thickness (in this study)
    • The study also found a benefit to education level preventing cortical thinning
Since we're talking about brains. I wanted to pour a little nutrition into this piece too: an article released this week found eating a higher quality diet (you know, one that includes lots of fruits, veg, fish, nuts, whole grains, dairy, and limits sugary drinks) correlated to larger brain volume than those who ate poorer quality diets. Also noteworthy is that our brain volume declines with age, so high quality diets may help slow this process, keeping our brain younger.

What did we learn?
  1. Don't forget to exercise (get it?)
  2. Exercise and a high quality diet can help keep our brains from expiring prematurely 
  3. This research adds to the existing (aged) body of evidence (see what I did there?) that brain health is tied to external factors like diet and physical activity
Here's a good place to get started if you're looking to get more physically active.

Thursday, April 12, 2018

One Easy Thing You Can Do to Prevent Weight Gain

In the battle of the bulge, there is one easy thing dietitians tell their clients that they CAN do, rather than focus on all the things not to do and not to eat. Though, personally I like to make the liberating statement "don't 'diet', restrict, or count calories", these behaviours are totally counter-productive to health and enjoying life (truly, research says so.)

You're dying to know the secret, right? Well, the secret is: It's not a secret, it's not a gimmick, it's not hard, it doesn't cost anything, and YOU already control it. Ready?

Chew more and eat slower!

Too simple? But not really. A recent study of more than 59 thousand people compared "fast", "normal", and "slow" eaters. The findings are fascinating, worth sinking your teeth into (slowly - get it?)
  • Stats of the slow-eating group:
    • Significantly higher number of women
    • Lower average BMI (22.3kg/m2)
    • Lower number of obese people (21.5%)
    • Smaller average waist circumference (80.1cm)
    • Consumed less alcohol, and less frequently
    • Lower number of habitual smokers
  • Facts from the fast-eating group:
    • Significantly less women
    • Significantly higher average BMI (25.0 kg/m2)
    • More obese people (44.8%)
    • Larger average waist circumference (86.8cm)
Proposed reasons for this association are that eating slowly and chewing helps increase feelings of fullness and satiety before an excess amount of food/calories are consumed. There's a whole complex system of hormones and gut bacteria at play here.

The study found that decreasing eating speed can lead to reductions in BMI, waist circumference, and obesity.

Two more things the study found to help curb weight gain:
  1. Not eating after dinner
  2. Not eating within two hours of sleeping
Avoiding these help reduce excess body weight. Studies have found people who snack after dinner and within two hours of sleeping have a higher likelihood for metabolic syndrome.

A few points to tie this all together:
  • Dieting, restriction, and rules around food cause more problems than they solve: Often leading to a preoccupation with food, an increased likelihood of binge eating, weight regain, psychological problems, yoyo dieting, and development of disordered eating patterns. Further reading here, here, here
  • Lack of sleep wrecks havoc with hormones that are related to food consumption like hunger, fullness, and metabolism
  • Mindfulness or "intuitive eating" are terms that crop up in the above articles. Basically, savouring and enjoying your food includes eating more slowly and being "present". This kills two birds with one stone: Eating slower and taking the time to really enjoy your meal/treat without depriving yourself
Food and eating are enjoyable parts of the human experience. Memories with friends and family usually stem from social time involving food. Taking a straw and sucking the fun out of food... sucks...