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John Speakman

@johnspeakman4.bsky.social
1.7K followers 1.1K following 143 posts

Scientist interested in energy balance - hence obesity and aging. Running labs in China (Shenzhen) and Scotland (Aberdeen). Co_EIC life metabolism. Also likes photography: especially wildlife.

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John Speakman @johnspeakman4.bsky.social · 09/09/2026
Soldier ants. South of France. Nikon z9 Nikkor 105mm macro lens.
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John Speakman @johnspeakman4.bsky.social · 07/09/2026
Grasshopper. Provence, South of France
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John Speakman @johnspeakman4.bsky.social · 09/08/2026
...and a landed one, lowering mouthparts to feed. Nikon Z9
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John Speakman @johnspeakman4.bsky.social · 09/08/2026
Hoverfly in flight. Scotland, UK. Nikon Z9 1/2500s 105mm f2.8 macro lens. even at this speed the wings are blurry
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John Speakman @johnspeakman4.bsky.social · 26/07/2026
My barista today made me a latte with a coronal section of a mouse brain on the top.
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John Speakman @johnspeakman4.bsky.social · 01/07/2026
Common green bottle fly (Lucilia sp.). So beautiful a thing commonly swatted to a pulp without a second thought.
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Royal Society Publishing @royalsocietypublishing.org · 09/06/2026
Our reviewer rewards recognise the vital contribution reviewers make to the publishing process. When you review an article in one of our journals, you'll be eligible for a discount towards the Article Processing Charge of publishing in our fully open access journals: royalsociety.org/journals/rev...
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Life Metabolism @lifemetabolism.bsky.social · 03/05/2026
New issue online in Life Metabolism: Vol. 5 Issue 2 brings together new work on mitophagy, gut circadian rhythms, MASLD, calorie restriction, β-cell function, fasting-induced hepatic lipid metabolism, and precision nutrition. Explore the full issue: academic.oup.com/lifemeta/iss...
academic.oup.com
Volume 5 Issue 2 | Life Metabolism | Oxford Academic
Life Metabolism aims to provide an open access platform for the publication of works of high significance and broad interest in all areas of metabolism
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Life Metabolism @lifemetabolism.bsky.social · 03/05/2026
Original Article @johnspeakman4.bsky.social: A functionally integrated cross-tissue alternative splicing program during short-term calorie restriction doi.org/10.1093/life...
doi.org
Validate User
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Life Metabolism @lifemetabolism.bsky.social · 28/04/2026
New issue online | Life Metabolism Vol. 5 Issue 1 features Research Highlights and Original Articles spanning circadian metabolism, macrophage sensing, gut urate metabolism, the gut–liver axis, lean MAFLD, and hepatic autophagy. Read the issue: academic.oup.com/lifemeta/iss...
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John Speakman @johnspeakman4.bsky.social · 12/04/2026
male wigeon. Resplendent.
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John Speakman @johnspeakman4.bsky.social · 12/04/2026
really looking forwards to this... lets hope there will be enough jet fuel to attend!!
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Life Metabolism @lifemetabolism.bsky.social · 30/03/2026
Reducing the strain on calorie restriction @johnspeakman4.bsky.social url: academic.oup.com/lifemeta/art...
academic.oup.com
Reducing the strain on calorie restriction
Abstract. Calorie restriction (CR) is a nutritional intervention known to delay aging and extend lifespan across a wide range of species, raising the possi
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John Speakman @johnspeakman4.bsky.social · 24/10/2025
RACMEM 2025 is over and everyone is home safely. Time for some relaxation and photography. White throated kingfisher. zoom in for feather details. Nikon Z9 with 600m f4 lens. 1/1000s f5.6.
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John Speakman @johnspeakman4.bsky.social · 20/10/2025
Immature black winged stilt. Shenzhen. October 2025. Nikon z9 600mm f4 1/10000s
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John Speakman @johnspeakman4.bsky.social · 23/09/2025
RACMEM 2025 Important notice Registrations will close on the 30th September (or when venue capacity is reached if sooner). Late registrations will not be accepted. If you wish to attend and didn't yet register this is your last chance. Please register at www.racmem.com Please retweet.
racmem.com
Home | RACMEM
Recent Advances and Controversies in the Measurement of Energy Metabolism
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John Speakman @johnspeakman4.bsky.social · 02/09/2025
Bee fly eye. Zoom in for detail of ommatidia. Nikon z9 with 105,, f2.8 macro and 250 Raynox. 1/6400 s f10
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Kevin Hall @kevinh-phd.bsky.social · 01/09/2025
After years of work with @juliabelluz.bsky.social, it's hard to believe that our book FOOD INTELLIGENCE will be published this month! @barnesandnoble.com has 25% off pre-orders placed on Sept 3-5. www.barnesandnoble.com/w/food-intel...
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John Speakman @johnspeakman4.bsky.social · 31/08/2025
Bee fly with pollen on its face. Nikon z9 with 105mm f2.8 macro lens and Raynox 250. 1/6400 s f10.
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John Speakman @johnspeakman4.bsky.social · 30/08/2025
Two flies on a dead shrew. Nikon Z9 with 105mm f2.8 macro lens with raynox 250 fitted. !/6400 s f4
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John Speakman @johnspeakman4.bsky.social · 16/08/2025
Singer and bassist. Meeting jazz club, Shenzhen. Nikon Z6
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John Speakman @johnspeakman4.bsky.social · 09/08/2025
Li River. Guilin to Yongshou. 2006. Taken on film and now digitised.
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John Speakman @johnspeakman4.bsky.social · 02/08/2025
flying carrion crow against blue sky. Aberdeen, Scotland, UK. August 2025. Nikon Z9 with 200mm f2.8 lens. 1/10000s
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John Speakman @johnspeakman4.bsky.social · 03/07/2025
RACMEM 2025 Abstract submission for contributed short talks and posters is now open. There will be a bunch of 500 USD prizes for the best talks and posters, by ECRs, post docs and students. Abstract submission form at racmem.com
racmem.com
Home | RACMEM
Recent Advances and Controversies in the Measurement of Energy Metabolism
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John Speakman @johnspeakman4.bsky.social · 03/06/2025
wood pigeon on silver birch tree. Aberdeen. May 2025.
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John Speakman @johnspeakman4.bsky.social · 11/05/2025
Chinese pond heron in summer plumage. May 2025. Shenzhen. Nikon z6.
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Alessandro Bartolomucci Lab @bartolomuccilab.bsky.social · 25/04/2025
Food insecurity drives obesity and adiposity, but how is unclear. A recent study by @clemmensenc.bsky.social developed a mouse model for this phenomenon lnkd.in/d8pEp2qv Happy to share a commentary written with @johnspeakman4.bsky.social with our take on that study doi.org/10.1002/oby....
doi.org
Scarce and unpredictable, yet obesogenic: modeling the impact of food insecurity on adiposity in mice
Click on the article title to read more.
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Cláudia Gil @claudiagil93.bsky.social · 26/04/2025
Check out this great commentary by @bartolomuccilab.bsky.social and @johnspeakman4.bsky.social on our recent paper, that investigates the role of #foodinsecurity on energy homeostasis and #adiposity in mice 💡
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Kevin C Klatt, PhD, RD @kcklatt.bsky.social · 30/04/2025
Issues of diet design in rodent studies discussed here with @kevinh-phd.bsky.social @johnspeakman4.bsky.social pubmed.ncbi.nlm.nih.gov/37485302/
pubmed.ncbi.nlm.nih.gov
Chowing down: diet considerations in rodent models of metabolic disease - PubMed
Diet plays a substantial role in the etiology, progression, and treatment of chronic disease and is best considered as a multifaceted set of modifiable input variables with pleiotropic effects on a va...
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John Speakman @johnspeakman4.bsky.social · 10/04/2025
RACMEM 2025 to be held in Shenzhen 13th to 17th October is now open for registration. Please spread the word. www.racmem.org
racmem.org
Home | RACMEM
Recent Advances and Controversies in the Measurement of Energy Metabolism
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John Speakman @johnspeakman4.bsky.social · 27/03/2025
Looking for new drugs to treat obesity by repurposing old ones. Very happy to have been part of this study looking at the weight loss effects of Halofuginone acting via both FGF21 and GDF15. In Science Advances www.science.org/doi/10.1126/...
science.org
The clinical antiprotozoal drug halofuginone promotes weight loss by elevating GDF15 and FGF21
Halofuginone curbs weight gain in mice and pigs.
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John Speakman @johnspeakman4.bsky.social · 10/03/2025
Coming soon. Registration for RACMEM 2025 to be held in Shenzhen China will open in early April. Keep an eye on the site www.racmem.com places limited to 230. please retweet (or whatever the equivalent is on here)
racmem.com
Home | RACMEM
Recent Advances and Controversies in the Measurement of Energy Metabolism
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John Speakman @johnspeakman4.bsky.social · 06/03/2025
Thanks Dan for posting.
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Kevin C Klatt, PhD, RD @kcklatt.bsky.social · 23/02/2025
MAHA nutrition advisor & chiropractor says the 1st nutrition issue he wants addressed is the 'food pyramid', a USDA food guide tool that was sunset in 2011 (it's been MyPlate since). Glad to see we are finally taking nutrition very seriously. www.foxnews.com/food-drink/a...
foxnews.com
American nutrition a top priority for MAHA as the 'Knowledge Doc' weighs in
"The Knowledge Doc" Eric Berg is taking a stand in the fight for better nutrition as RFK Jr. moves to challenge food industry to "Make America Healthy Again."
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John Speakman @johnspeakman4.bsky.social · 19/02/2025
Yellow-eyed penguin. OPERA Eco reserve. Otago peninsula, near Dunedin, South island, New Zealand.
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John Speakman @johnspeakman4.bsky.social · 09/02/2025
Paradise shelduck in the afternoon sun. New Zealand endemic. Christchurch. Feb 2025. Nikon z6 with 120mm lens. F4 1/3200s
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John Speakman @johnspeakman4.bsky.social · 08/02/2025
University of Canterbury. Christchurch, New Zealand. Feb 2025
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John Speakman @johnspeakman4.bsky.social · 02/02/2025
Gannet coming in to land looking like a ballerina. They are so graceful in the air but so clumsy on the ground. Murawai gannet colony, North Island, New Zealand. February 2025. Nikon z9 with 200mm 1/4000s f14.
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John Speakman @johnspeakman4.bsky.social · 02/02/2025
Australasian Gannet in flight. Murawai gannet colony. North Island, New Zealand. February 2025. Nikon Z9 with 200mm lens. 1/3200s f14
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John Speakman @johnspeakman4.bsky.social · 27/01/2025
Swamp hen adult. Auckland. New Zealand. January 2025. Nikon Z9 200mm lens. 1/4000s f5.6.
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conscienhealth.bsky.social @conscienhealth.bsky.social · 26/01/2025
How robust are the links between #diet, #obesity, and #health? A new study in @naturefood.bsky.social suggests some fundamental flaws. HT: @johnspeakman4.bsky.social conscienhealth.org/2025/01/the-...
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John Speakman @johnspeakman4.bsky.social · 26/01/2025
Spur-winged plover. Auckland. New Zealand. Nikon z9 200mm lens. hand held 1/4000s f8
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John Speakman @johnspeakman4.bsky.social · 25/01/2025
Immature swamp hen stepping out. PiHa North Island, New Zealand. January 2025. Nikon Z9 200mm + 2x converter. 1/4000 f8
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John Speakman @johnspeakman4.bsky.social · 24/01/2025
A rather angry looking spotted dove. Auckland, New Zealand. Nikon Z9. 200mm lens with 2x converter. f5.6 1/1250s hand held.
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John Speakman @johnspeakman4.bsky.social · 24/01/2025
Tikaokao Quail New Zealand. Auckland. North Island. Nikon Z9 200mm lens with 2x teleconverter. f 5.6 1/1250s January 2025
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John Speakman @johnspeakman4.bsky.social · 23/01/2025
LIFE METABOLISM Travel awards @lifemetabolism.bsky.social sponsored by @sablesys.bsky.social and the final winner is Elijah Lowenstein @lowensteined.bsky.social from BIDMC, Harvard to attend the Keystone meeting on Ingestive behaviour. Congratulations...
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John Speakman @johnspeakman4.bsky.social · 22/01/2025
LIFE METABOLISM Travel prizes @lifemetabolism.bsky.social Sponsored by @sablesys.bsky.social Our 3rd winner is Zeyuan Zhang from Stanford who will present his work on novel products of the CART gene at the Metabolic signalling cold spring harbor meeting Congrats...
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John Speakman @johnspeakman4.bsky.social · 22/01/2025
LIFE METABOLISM Travel awards. @lifemetabolism.bsky.social sponsored by @sablesys.bsky.social Our 2nd prize winner is @lundjens.bsky.social from the Novo-nordisk foundation to attend the keystone meeting in Banff to show his work on whether fatness drives obesity in mice on HFD Congrats..
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John Speakman @johnspeakman4.bsky.social · 22/01/2025
LIFE METABOLISM Travel award @lifemetabolism2 Sponsored by @SableSys The first of our 4 winners is Enchen Zhou from UC San Diego who will go to the ADA meeting In Chicago this summer to present his work on Liver X receptors in the gut Congratulations...
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John Speakman @johnspeakman4.bsky.social · 22/01/2025
@lifemetabolism.bsky.social LIFE METABOLISM travel awards Sorry for the delay in reaching a decision on these awards sponsored by @sablesys.bsky.social . This year we had a very strong field which has necessitated several rounds of review. Finally, the decisions about who has won have been made 1/2
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