Nick Norwitz Profile picture
Dec 23 6 tweets 3 min read
#Vegan🌱#keto (low sat fat, 0 cholesterol)
vs.
Meat and Egg heavy diet + 120g net carbs

N=1 Crossover experiment

Surprisingly, LDL >300 mg/dL on vegan keto and ~100 mg/dL on meat and egg plus carb diet 🤯

👉 If this doesn't make you curious, I don't get you
2/ This contradicts the explanation that sat fat is the primary driver of ⬆️ LDL on low-carb

While it may represent an outlier case (& sat fat may primarily drive⬆️LDL in others), that these lipid results can present in anyone requires an explanation beyond conventional wisdom
3/ 2022 has been a good year for study of the Lean Mass Hyper-Responder phenotype with 5 manuscripts published:

-Demonstrating presence of the phenotype

-Providing explanation in the form of the Lipid energy model #LEM

-Calling for further research
4/ Looking forward to 2023 and beyond, I am BEYOND excited to pursue further work to help better understand the "what" and "how" of LMHR!

We need to better classify the phenotype and untangle the mystery within the mechanism!
5/ Importantly this isn't an "us vs. them"

This is NOT about diet tribes, disproving the lipid heart hypothesis, etc. Not at all

This is about pursuing an open ? with implications for our understanding of lipidology & help direct patient care... wherever the data fall
6/ So, for now, all I have to ask is, "do you have a good explanation for these results in this patient?"

If not...

WATCH
THIS
SPACE!

• • •

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More from @nicknorwitz

Dec 21
1/7)🤯 New study in PNAS shows low-doses of sweetener aspartame can produce anxiety behavior 🧠in mice that's TRANSMITTED to their children and grandchildren 👦👶

Video:

Thread 🧵👇
2/7) The first experiment the team performed in this study was to expose male & female mice to normal drinking water or water with 0.015-0.03% aspartame

Notably this dose is only 7/8-15% the FDA recommended max dose for human intake, and the equivalent of 2-4 diet sodas per day
3/7) They found that even at this low-dose, anxiety behavior was increased in male and female mice as measured by an open-field test (OFT)

In this common assay, mice are placed in a playground of sorts and the less time they spend in the open center represents more anxiety
Read 7 tweets
Dec 20
Thread🧵on Seed Oils that will please Nobody😲

1/10) First, why this thread?

Because I've seen seed oils rise quickly as a perceived villain within (and outside) the low-carb community as a presumed critical cause of metabolic dysfunction

Is this the case? ...
2/10) Before I go on, I will be clear about my Personal choices

I am convinced that intake of high amounts of oxidized highly processed soy, corn, grapeseed oil etc. are 'sub-ideal'

I never use in my own cooking, preferring ghee, avoid oil, EVOO, etc.
3/10) That said the tendency of TWto promote simplicity and vitality over nuance has - I believe - contributed to an over-eager messaging and vilification of "seed oil"

-

HERE TAKEN to BROADLY to mean oils from seeds/nuts high in Omega-6 relative to most animal-based foods
Read 11 tweets
Dec 18
STUNNING! #Mitochondria Judo 🥋!

1/6) New Paper @NatMetabolism shows how fat cells in lean healthy mice and infants can change what would normally be an inflammatory signal into a beneficial one

⬆️mito-biogenesis

⬆️thermogenesis

#obesity

Video: Image
2/6 Research team finds that young fat cells are resistant to inflammatory response to mtRNA (or synthetic analog) and INSTEAD respond with increased mitochondrial protein content

Basically, converts would-be inflammation into signal for new mitochondria! Image
3/6 They find the mediator of inflammatory response to mtRNA is "IRF7" protein.

IRF7 is low in adipocytes of lean human children, but increased with #obesity (mice and human)

In a phrase IRF 7 is the "judo flip" and low IRF7 permits mite-biogenesis response to mtRNA Image
Read 6 tweets
Dec 17
🚨New paper in @Nature reveals link between #microbiome & #exercise motivation!🧠🐁

👉Provides foundational insight that could lead to dietary practices & supplements to promote exercise motivation

Video:

@hubermanlab
#dopamine

1/ Thread🧵👇
2/ The study in question is a mouse study, as you can really perform these fine mechanistic study in animal models

Data show that genetics variation among mice was a minor contributor and the variations in microbiome composition were more important for physical performance...
3/ To show the microbiome mediates the effects, they knocked out the microbiome with antibiotics in high-performer mice and the result was an impairment physical performance by 50%! (2a)

By contrast, microbiome transplant could enhance performance.
Read 10 tweets
Dec 17
Is fruit healthy? 🍌🍉🍇🥭🍓

Thread 🧵...

1/ Some argue most fruit has sugar. Sugar is bad. Therefore, fruit is not a health food

Others may argue that fruit is natural; therefore, universally healthy.

Both perspectives are oversimplifications...
2/ IMO, the question of fruits' healthfulness can be assessed based on primarily on 3 principles:

(i) - Nutrient density vs glycemic impact

(ii) - Metabolic profile of the consumer

(iii) - What's the "control?"
3/ Starting w/ nutrient density vs GI (or more properly GL)

Some fruits, e.g.wild blueberries, are quite dense in nutrients, with very mild glycemic impact.

Others, like apples or mango - while delicious - provide less nutrient bang for the buck, so to speak...
Read 10 tweets
Dec 4
🚨Cool New Study!

Omega-3 fats have sex-specific impacts on lipids, LDL, HDL & TG!

Thread + video breakdown...

1/ In this new paper published in the @LipidJournal, researchers performed a Double-Blinded Randomized Crossover to see how EPA & DHA imapct lipids and mean dn women
2/ The study was a has 21 subjects each with at least 1 marker of Metabolic Syndrome

There was a 4 week run-in period, followed by 10w on 3g/d of EPA or DHA, a washout period, and then the other long-chain fatty acid. Again, order was randomized and study was double-blinded...
3/ Researchers found:

(1) EPA and DHA both ⬇️ TG.

(2) EPA and DHA both ⬆️ LDL-C/ApoB ratios, suggesting more large fluffy healthy buoyant LDL-C
Read 11 tweets

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