8,000 at 20

(Part 2 of 14 in series, John Briffa's "A Good Look at Good Health")

Walking may be ideal exercise as we age

Memorize this: “8,000 at 20”

That is: “8,000 steps at a 20-minute-mile walking pace.” I’ll explain below, but first…

The researchers involved in this study then looked at what levels of activity appeared to be associated with BENEFITS for PHYSICAL and MENTAL health. What they found was that improved physical health was seen in individuals taking 8,000 steps a day at [a certain] intensity.

The threshold above which there was an associated benefit for MENTAL health was lower: only 4,000 steps a day at [a certain] intensity.

~ John Briffa

It’s not about how far you walk; Don’t worry about how long your legs are. It’s about how hard you are working when you walk. Basically, you need to do the steps at a level of exertion that is roughly 3 times you base metabolic rate; That is to say, the rate at which your body burns energy when you are sitting still doing nothing. The intensity this research points at is roughly a 20-minute-mile walking pace for average height/legs. This is faster than “I’m strolling” but well below “I’m late! speed walking”.

Just go walk for 45 minutes every day.


HIT improves… your body’s sugar handling?

(Part 3 of 14 in series, John Briffa's "A Good Look at Good Health")

Short bursts of high intensity activity found to improve body’s ability to handle sugar

In this particular study, individuals engaging in the ‘high intensity interval training’ (HIT) sprinted on a exercise bike with maximum effort for 30 seconds at a time with 4 mins of rest in between. 6 sessions were performed over a two-week period, with 4-6 ‘sprints’ in each session. I was interested to read a recently published study which used an identical exercise schedule. The focus here was not on fitness benefits, but on the impact HIT might have on individuals’ ability to handle sugar.

~ John Briffa


The calorie principle

(Part 4 of 14 in series, John Briffa's "A Good Look at Good Health")

Why the evidence on nuts and weight makes a mockery of the calorie principle

There are a number of potential mechanisms that explain why nuts may not be fattening which were explored in a recent review that appeared in the Journal of Nutrition recently. I’ve summarised them (along with one mechanism that is not discussed but I think is important) below:

Studies show that nuts tend to be effective at satisfying the appetite, which can mean that individuals just end up eating less of other foods. The percentage of calories that come from nuts that are compensated for by eating less of other foods varies from study to study, but comes in at around 70 per cent.

~ John Briffa


What is “intermittent fasting”?

(Part 5 of 14 in series, John Briffa's "A Good Look at Good Health")

Quelling insulin will help protect against these conditions, and will facilitate fat loss too. One way to quell insulin levels is to eat a diet largely devoid of the foods that cause surges in blood sugar such as those [of] added sugar as well as starchy ‘staples’ like bread, potatoes, rice pasta and breakfast cereals. Another way, though, to moderate insulin levels is to extend the time between eating. This, in essence, is what intermittent fasting is about.

~ John Briffa from, http://www.drbriffa.com/2012/03/01/my-times-piece-on-intermittent-fasting/


Metabolic advantage

(Part 6 of 14 in series, John Briffa's "A Good Look at Good Health")

Is there such as thing as a ‘metabolic advantage’?

The idea that a particular diet might have weight loss benefits that cannot be predicted utterly by the calories contained in that diet is often referred to as ‘metabolic advantage’. I’ve found it to be a vexed topic, with commentators on it belonging to one of two camps. On the one hand we have those that believe ‘a calorie is a calorie’, and that the form that calories come in have not bearing on their impact on weight. On the other hand, we have those who maintain that the form calories come in can influence body weight in a way that is independent of the number of those calories, or who are least open to the idea that his can be true. Just to be clear, I am in the latter camp.

~ John Briffa


It looks like our ancient ancestors ate a low-carb diet

(Part 7 of 14 in series, John Briffa's "A Good Look at Good Health")

Official recommendations are normally that about 60 per cent of the calories we consume should come from carbohydrate. That’s actually higher than the most carbohydrate-rich hunter-gatherer diet of all, and about three times the average carbohydrate percentage in such diets. The authors of this study conclude, ‘…the range of energy intake from carbohydrates in the diets of most hunter-gatherer societies was markedly different (lower) from the amounts currently recommended for healthy humans.’

~ John Briffa from, http://www.drbriffa.com/2011/10/11/it-looks-like-our-ancient-ancestors-ate-a-low-carb-diet/

Not “low carb” as in some wacky, extremist diet. I’d prefer to call it a “normal carb diet” where you simply try to get your carbs from tubors, fruits and veggies, not from added sugars and refined grains.


Is obesity all in the mind?

(Part 8 of 14 in series, John Briffa's "A Good Look at Good Health")

My position, and that of a growing number of researchers, is that there’s more to obesity than calorie balance, and that body weight and fat mass is regulated by a complex system that involves an array of hormones and feedback mechanisms.
In recent months I’ve become interested in the potential role of a hormone by the name of leptin in obesity.

~ John Briffa from, http://www.drbriffa.com/2011/03/10/is-obesity-all-in-the-mind/

It’s not “in the mind” in the sense that you can imagine your way to weight loss. But there’s definitely MORE to weight loss than the balance of calories. My experience is that the best way to lose weight is to simply reduce my calorie intakes slightly — no need to count everything and aim for a computed target intake. At the same time, include some strength training (a ton is not required, but walking/cardio is NOT what worked for me.)


Maybe turn off the TV and go to bed

(Part 9 of 14 in series, John Briffa's "A Good Look at Good Health")

Six years ago I decided to dramatically reduce the amount of time I spent watching TV, and this single intervention (I believe) had a dramatic effect on my life. It liberated a significant amount of time that I could devote to perhaps more useful and rewarding pursuits. You may be thinking that I’m referring to things like writing or exercise. Actually, I’m referring mainly to sleep.

~ John Briffa from, http://www.drbriffa.com/2012/07/19/want-to-lose-weight-maybe-turn-off-the-tv-and-go-to-bed/

Sleep — specifically, learning about sleep, fixing my sleeping environment and getting more and better quality sleep — is the SINGLE most important thing I changed in my journey these last few years.


Exercise boosts the metabolism? It seems the reverse might be true

(Part 10 of 14 in series, John Briffa's "A Good Look at Good Health")

However, he went on to talk about a mechanisms here that came as quite a surprise to the audience, I think: aerobic exercise can suppress the metabolic rate. We’re often told that exercise not only increases calorie burn while we’re exercising, and also for some time after. It turns out, that may well not be the case for many people. In fact, according to research, the opposite is quite likely to be the case.

~ John Briffa from, http://www.drbriffa.com/2012/06/15/exercise-boosts-the-metabolism-it-seems-the-reverse-might-be-true/

Metabolism, and the human body in general, is very complicated. Excercise turns out to not function AT ALL the way I thought it did. I thought you could just “excercise more” to burn a few hundred extra calories a week and VOILA! L’SKINNY. Nope. Exercise is great! Good for your health, etc. But, at the quantities I do, it is not the driver of my weight loss.

Meanwhile, I’ve spent about 5 years now actively learning about food, biology, health, fitness, chemistry and more… and I’m still convinced I know very little. :/