Tag Archives: diet

Meal timing and the circadian regulation of nutrient partitioning.

Breakfast [in the morning] strengthens circadian rhythms and reduces postprandial glucose excursion after lunch (Jakubowicz et al., 2017)

 

 

 

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Ketosis in an evolutionary context

Humans are unique in their remarkable ability to enter ketosis.  They’re also situated near the top of the food chain.  Coincidence?

During starvation, humans rapidly enter ketosis; they do this better than king penguins, and bears don’t do it at all.

Starvation ketosis

 

Starvation ketosis

Humans maintain a high level of functionality during starvation.  We can still hunt & plan; some would even argue it’s a more finely tuned state, cognitively.  And that’s important, because if we became progressively weaker and slower, chances of acquiring food would rapidly decline.

Perhaps this is why fasting bears just sleep most of the time: no ketones = no bueno..?

Observation: chronic ketosis is relatively rare in nature. This doen’t mean animals evolved a protective  mechanism against ketosis.

 

 

Animals with a low brain/carcass weight ratio (ie, small brain) don’t need it. Babies and children have a higher brain/carcass weight ratio, so they develop ketosis more rapidly than adults. Is this a harmful process? No, more likely an evolutionary adaptation which supports the brain.

ketones age

The brain of newborn babies consumes a huge amount of total daily energy, and nearly half comes from ketones.  A week or so later, even after the carbohydrate content of breast milk increases, they still don’t get “kicked out of ketosis” (Bourneres et al., 1986).  If this were a harmful state, why would Nature have done this?  …and all those anecdotes, like babies learn at incredibly rapid rates… coincidence?  Maybe they’re myths.  Maybe not.




 

Ketosis in the animal kingdom

Imagine a hibernating bear: huge adipose tissue but small brain fuel requirement relative to body size and total energy expenditure.  No ketosis, because brain accounts for less than 5% of total metabolism.  In adult humans, this is around 19-23%, and babies are much higher (eg, Cahill and Veech, 2003Hayes et al., 2012).

 

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On the impact of diet on circadian phase setting

We’ve seen that meal size and frequency can influence circadian rhythms, but here are some examples of how nutrients can, too.

Circadian phase advance: going to bed earlier, waking up earlier.  Blue blockers at sunset, bright light at sunrise.  Flying east.  Autumn.

Circadian phase delay: staying up late, sleeping in.  Flying west.  Spring.  Using smart phones, tablets, and iPads in bed at night.  Light pollution.

Relative to adolescents, infants and children are circadian phase advanced.  This is part of what is fueling the movement to delay high school start times.  Kids are mentally better prepared to work later in the day.  With early school start times, performance is down in the morning, but they kill it on video games after school.  Delaying start time by an hour won’t totally fix this, but could help.

 

 

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Low carb, low glycemic index, or something else entirely

Why Low Carb?

OmniCarb (Sacks et al., 2014)

Study design & results in a nutshell:

5 weeks, low(ish) vs. high carb (40 vs. 58%) with the calorie difference split between protein (23 vs. 16%) and fat (37 vs. 27%).  In other words, the low(ish) carb diet was higher in protein and fat.  And there was 2 versions of each diet —  a high and low glycemic index.  Lots of crossing over; all in all, weak intervention but decent study design & execution.

Aaaand nothingsauce nothingburger.  Goal was insulin sensitivity, not weight loss.

 

glucose and insulin

 

 

 

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Hormesis and a blow torch

I joke about hormesis a lot because it has little-to-no scientific proof. Maybe it’s true, but it’s really hard to prove experimentally.

Imo, whatevs. But I do walk the walk: Hormesis of the AGEs.

disclosures: I’m a horrible food photographer… it’s really hard to take pictures while actively blow torching food! (and not burning down the house)

and 2) bowls don’t last forever, especially mine.

 

My weapon of choice: this and these

 

 

 

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Endurance Performance Doesn’t Decline on a Low Carb Diet

The new study by Zinn and colleagues doesn’t debunk ketoadaptation. And the authors agree!

In brief, it was 5 ~50-year old recreational endurance athletes. They’ve been training a lot for a very long time. In other words, one way to view this study is the opposite of n00b gainz. Experienced exercisers don’t typically make gains in 10 weeks without drastically changing their training program or increasing protein intake – neither of which occurred in this study.

 

 

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Long-term fat adaptation.

Ketoadaptation

More on physical performance and ketoadaptation

A timeline of ketoadaptation.

 

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Allu-lujah: the new Quest Hero bars

On that sweetener in the new Quest Hero bars: allulose (formerly known as D-Psicose).

1. I’m sure they were quick to adopt the alternate nomenclature because it’s hard not so say Piss-cose lol

2. Nutrition-wise, Hero bars are basically Quest Lite. A bit less fibre. But I really think they’re getting much better at texture.

3. On to allulose. It’s not really like sugar – even though the FDA says it must be labeled as such – because it carries virtually no calories and actually blunts the blood glucose spike from a meal.

 

Exhibit A. n=20 healthy peole: 7.5 g D-psicose alone, 75 g maltodextrin alone, 75 g maltodextrin + 2.5, 5, or 7.5 g D-psicose (Iida et al., 2008)

amazeballs

 

 

 

 

 

Exhibit B. n=26, zero or 5g psicose with a standardized meal (Hayashi et al., 2010). Note: there are ~12 grams of allulose in a Hero bar.

It works better in diabetics.

 

 

They did a 12-week study where psicose was dosed 3 times a day, 5 grams each time, and showed it was perfectly healthy. Some markers even improved.

 

Exhibit C. Psicose metabolism (Iida et al., 2010)

In doses ranging from 5 to 30 grams, up to 70% is excreted intact and the rest does not go to farts.

It’s virtually calorie-free:

 

 

and is barely fermentable (compared to FOS):

 

 

compare to other low carb protein bars here, get the new Quest bars here, or just buy some straight allulose and experiment with it!

Mechanisms? 1) it’s not sugar, but it still enhances glucose disposal; and 2) some animal studies show it enhances liver glucose uptake. Idk.

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Scheduled Meals for Circadian Entrainment

Scheduled Meals for Circadian Entrainment

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The alkaline diet is bullshit. Proof: vinegar is the bomb

1. Whether it’s Balsamic, sherry, red wine, apple cider, or even plain distilled white, vinegar is a great condiment (P<0.05). Try cutting your favorite with a more concentrated one for more fun (be careful, it can burn you; I’d start with 1:20 or 5%).

2. It reduces the glucose and insulin response to a meal.

World’s coolest fatty acid?

 

 

Exhibit A: 20 g apple cider vinegar, 40 g water, and 1 tsp saccharine two minutes prior to “a white bagel, butter, and orange juice (87 g total carbohydrates)” (Johnston et al., 2004)

 

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Hormesis of the AGEs

Some semi-random thoughts (ie, I might’ve had too much coffee haha)

-I’ve never really been a fan of the concept of “hormesis,” because you can basically say it of just about anything.  Kinda like “vestigial,” because, like, you technically don’t need your legs…

-We’ve seen actual human trials on AGEs, I even wrote a relatively mature blog post about ’em (this isn’t gonna be like that). Tl;dr: they really do some bad things in experimental settings. No, not bad like playing in traffic; bad like inflammation, oxidative stress, etc.

-Some say the ability to cook was a major evolutionary factor. Improved digestibility, nutrient bioavailability, energy extraction, reduced toxins, etc. I don’t know, maybe it was just seafood/DHA. Whatevs, I don’t really buy this line of reasoning anyway.  Maybe AGEs are not hormetic and are outright harmful; but cooking was better for our species because we died from other things long before the AGEs got us… or maybe this is a good reason to eat more baked mushrooms (as per Roncero-Ramos et al., 2016) haha.

-I follow the BTD (Blow Torch Diet™)* so seared meat and to a lesser extent plants can’t be unhealthy, right?

*seriously, I use this and these all the time.

 

 

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