Il nostro corpo è fatto di due tipi diversi di grasso, quello bruno e quello bianco (o anche giallo per la presenza di carotenoidi), quest’ultimo è quello più diffuso. Pensare al grasso con dei colori può sembrare strano, ma è realmente così ed è bene imparare distinguerli perché svolgono due ruoli diversi nel nostro organismo, entrambi importantissimi, da cui dipendono la nostra salute e la nostra forma fisica.
Il grasso bruno è presente in dosi limitate nell’uomo, mentre si trova in grandi quantità in quegli animali che in inverno vanno in letargo e quindi hanno bisogno di molto calore. Solo il neonato, che ha bisogno di stare al caldo dopo essere uscito dal pancione, ha parecchio grasso bruno (soprattutto nella zona delle ascelle e del collo), ma durante la crescita tende a trasformarsi in tessuto adiposo bianco. Ma vediamo le differenze.
Grasso bruno
Il tessuto adiposo bruno (Bat), come abbiamo accennato prima, aiuta il corpo a mantenersi caldo: il suo ruolo principale è quello di regolare il bilancio energetico, aiutando a bruciare le calorie, che a loro volta danno calore. È un elemento, ricco di mitocondri, molto prezioso anche per favorire il controllo del peso. Come abbiamo detto prima negli adulti è meno presente, ma c’è e lavora correttamente. Secondo uno studio di qualche anno fa, condotto dai ricercatori dell’Università di Maastricht in Olanda, il grasso bruno permette di regolare il consumo energetico in base alla temperatura ambientale.
È importante questo concetto perché si capisce come il nostro corpo sia impegnato a bruciare calorie in eccesso quando fa freddo e invece rallenta il metabolismo quando fa caldo. Quello che è emerso dagli studi è la presenza di poco grasso bruno nelle persone obese. Ciò vuol dire che coloro che sono in sovrappeso fanno più fatica a bruciare quello che mangiano e di conseguenza tendono ad accumulare. Il grasso bruno, ormai da anni, è al centro di numerosi studi perché potrebbe essere la chiave per sviluppare una terapia antiobesità.
Grasso bianco
Non si distingue da quello bruno solo per il colore. Questo grasso (Wat) è in grado di accumulare al suo interno grandi quantità di trigliceridi. Il tessuto adiposo bianco non è soltanto una riserva di grasso, ma è composto da cellule metabolicamente attive. È infatti in grado di sintetizzare i trigliceridi e immagazzinarli come riserva energetica, inoltre è un isolante termico, produce ormoni e idrolizza i trigliceridi depositati e immette acidi liberi nel sangue. Il wat, per rendere tutto più semplice, è il mezzo attraverso cui il nostro corpo accumula sostanze energizzanti e ci permette di avere energia (e non sentire la fame) tra un pasto e l’altro.
Molti scienziati stanno pensando di ridurre il grasso bianco in eccesso nelle persone obese, per sostituirlo con quello bruno, che invece brucia le calorie. Gli esperti dell’Istituto Garvan di Sydney hanno prodotto Bat in laboratorio, utilizzando le cellule staminali. L’obiettivo ora è quello di trapiantare queste cellule coltivate in provetta negli obesi per aumentare la loro capacità di sviluppare calore. Non è ancora ben chiaro come mai gli animali abbiano grandi quantità di questa sostanza e invece l’uomo ne abbia sempre meno: una spiegazione potrebbe essere lo stile di vita e gli agi. Il corpo umano, infatti, vive in ambienti caldi, si copre con indumenti termici e non è più esposto a temperature fredde.
L’ormone brucia grassi
L’ultimo studio collegato ai due grassi, infine, ha come protagonista il peptide natriuretico atriale, ormone prodotto dal miocardio che stimola il metabolismo dei grassi. Questa sostanza è in grado di trasformare il Wat in Bat, proprio quello che stanno cercando di fare molto scienziati in laboratorio. Per adesso lo studio è stato applicato su delle cavie, ma è emerso che l’ormone è capace di trasformare le cellule bianche in brune e aumenta il dispendio energetico. Per stimolare la produzione di quest’ormone c’è un modo molto semplice: fare sport. Ecco quindi che lo stile di vita ha sempre un ruolo molto importante nel mantenimento del peso e della salute.
Photo Credits| ThinkStock
I have learn a few good stuff here. Certainly price bookmarking for revisiting. I wonder how much attempt you place to create this sort of magnificent informative website.
strongest prescription allergy medication generic allergy pills allergy pills for adults
best online rx for sleep buy phenergan online cheap
cost deltasone 40mg prednisone 10mg cheap
Howdy would you mind stating which blog platform you’re using? I’m planning to start my own blog soon but I’m having a hard time selecting between BlogEngine/Wordpress/B2evolution and Drupal. The reason I ask is because your design and style seems different then most blogs and I’m looking for something unique. P.S My apologies for getting off-topic but I had to ask!
otc meds for abdominal pain order generic clozapine
expensive zit pills buy aczone no prescription low cost prescription acne medication
drugs for gerd prescription frumil 5mg over the counter
isotretinoin 10mg price buy accutane 40mg generic isotretinoin cheap
amoxil 500mg over the counter buy amoxicillin 250mg online cheap buy amoxil 500mg pills
buy sleeping tablets online uk buy provigil 200mg generic
buy azithromycin 500mg generic azithromycin pill buy azithromycin 500mg online cheap
gabapentin 100mg brand neurontin 800mg canada
I was very pleased to find this web-site.I wanted to thanks for your time for this wonderful read!! I definitely enjoying every little bit of it and I have you bookmarked to check out new stuff you blog post.
buy generic azithromycin 500mg azithromycin 500mg pills azithromycin 250mg brand
order furosemide 100mg for sale buy generic lasix
buy generic prednisolone order omnacortil 10mg sale prednisolone 20mg ca
order amoxicillin 500mg generic purchase amoxicillin generic order amoxicillin
order monodox online cheap doxycycline 200mg pill
buy ventolin 4mg generic cheap albuterol inhalator order ventolin inhalator generic
order augmentin 1000mg without prescription augmentin 1000mg pill
synthroid 75mcg usa levothroid sale order synthroid pills
where can i buy levitra order levitra 20mg sale
serophene without prescription where to buy clomiphene without a prescription buy clomiphene pills for sale
zanaflex generic purchase tizanidine for sale buy zanaflex medication
semaglutide 14 mg generic rybelsus online order rybelsus 14 mg drug
prednisone 20mg us buy deltasone 40mg prednisone 10mg tablet
semaglutide online order where to buy semaglutide without a prescription rybelsus online buy
oral isotretinoin 40mg isotretinoin 20mg tablet accutane 40mg cost
buy ventolin 4mg without prescription order ventolin inhalator sale albuterol pills
buy amoxicillin no prescription cost amoxil 250mg amoxil tablet
brand augmentin 1000mg augmentin 1000mg pill augmentin order online
zithromax 500mg drug purchase zithromax without prescription buy zithromax 500mg online
order synthroid 100mcg generic levoxyl tablets synthroid 150mcg pills
buy generic prednisolone 5mg order prednisolone 5mg generic prednisolone pills
buy generic clomid clomiphene 100mg brand clomiphene price
buy generic neurontin 600mg gabapentin 100mg cheap cheap gabapentin generic
furosemide where to buy purchase lasix pill lasix over the counter
viagra 100mg sale viagra 100mg cheap sildenafil next day delivery
buy generic doxycycline 100mg doxycycline 100mg ca buy doxycycline 100mg for sale
order rybelsus generic order rybelsus generic rybelsus online buy
real money casino slot game sugarhouse casino online
order levitra 20mg for sale levitra price order vardenafil 20mg pills
order lyrica pills purchase lyrica pill pregabalin canada
plaquenil 200mg us where to buy plaquenil without a prescription order hydroxychloroquine 200mg generic
zithromax suspension cost
buy aristocort 4mg triamcinolone medication aristocort 10mg for sale
cialis tadalafil 10mg order cialis 20mg cialis 20mg generic
cheap desloratadine desloratadine uk clarinex 5mg generic
cenforce 50mg uk where to buy cenforce without a prescription purchase cenforce generic
how to get claritin without a prescription purchase claritin online buy loratadine 10mg generic
order chloroquine pill buy generic aralen chloroquine pill
can i stop taking metformin when my sugar back to normal
order metformin 1000mg sale order metformin 1000mg generic purchase glycomet online cheap
buy orlistat medication order orlistat 60mg generic buy diltiazem generic
can zoloft make you gain weight
lisinopril and coffee
furosemide price
macrobid and flagyl
zovirax buy online cost acyclovir zyloprim 100mg drug
buy amlodipine pills for sale oral norvasc amlodipine 10mg brand
glucophage libido
does gabapentin make you high
lasix used for
order crestor 20mg generic order ezetimibe 10mg generic ezetimibe 10mg for sale
prinivil usa order lisinopril without prescription buy zestril generic
п»їzithromax
buy domperidone pill buy domperidone pills for sale buy sumycin 500mg without prescription
amoxicillin missed dose
cephalexin side effects in elderly
what happens when you stop taking gabapentin
cyclobenzaprine uk buy baclofen 25mg order baclofen generic
citalopram versus escitalopram
buy generic lopressor 100mg metoprolol 50mg generic lopressor 100mg cheap
I like this internet site because so much utile stuff on here : D.
ciprofloxacin for pneumonia
toradol 10mg brand buy generic ketorolac over the counter colchicine price
cephalexin brand
order atenolol generic atenolol 50mg canada order tenormin 50mg without prescription
methylprednisolone 4mg tablet medrol without prescription methylprednisolone 4mg tablet
buy generic propranolol online buy propranolol online buy clopidogrel without prescription
paper writing online purchase essay online write me a essay
bactrim used for
methotrexate 5mg usa purchase medex generic order coumadin sale
amoxicillin dosing
bactrim ds 800
can you take cephalexin if allergic to penicillin
oral meloxicam mobic us celebrex usa
order reglan pill cozaar 50mg generic order hyzaar generic
I couldn’t resist commenting
purchase flomax online cheap order tamsulosin 0.4mg generic celecoxib 200mg cheap
gabapentin 300mg used for
escitalopram oxalate price
nexium usa buy topiramate generic oral topamax 200mg
ondansetron online buy zofran medication order spironolactone 100mg generic
buy sumatriptan cheap levofloxacin 250mg usa levofloxacin over the counter
buy zocor cheap purchase valtrex online cheap valacyclovir us
avodart cheap buy dutasteride buy zantac 150mg without prescription
The subsequent time I read a weblog, I hope that it doesnt disappoint me as much as this one. I mean, I know it was my choice to learn, however I actually thought youd have something attention-grabbing to say. All I hear is a bunch of whining about one thing that you may fix in case you werent too busy looking for attention.
what are the side effects of cozaar 25 mg
citalopram 10mg reviews
depakote rash
propecia 1mg uk order generic diflucan 200mg fluconazole sale
ddavp in dic
purchase ampicillin for sale cheap monodox buy generic amoxil online
buy ciprofloxacin pill – buy trimethoprim without a prescription order augmentin 1000mg pills
purchase ciprofloxacin pills – order bactrim 960mg sale augmentin 1000mg without prescription
cozaar vs hyzaar
depakote withdrawal
citalopram (celexa)
ddavp thrombocytopenia
order generic ciprofloxacin – chloromycetin price order erythromycin 250mg sale
metronidazole 200mg sale – order cefaclor 250mg capsules zithromax pill
augmentin for bronchitis
Wow that was unusual. I just wrote an extremely long comment but after I clicked submit my comment didn’t appear. Grrrr… well I’m not writing all that over again. Anyways, just wanted to say fantastic blog!
diclofenac pronunciation
ivermectin 3mg online – sumycin pill order tetracycline 250mg online cheap
ezetimibe e rosuvastatina
diltiazem side effects forum
buy valtrex online cheap – buy nemasole without a prescription order zovirax 800mg online cheap
what is the cost of generic flomax
what class of drug is flexeril
ampicillin online buy penicillin antibiotic amoxil online buy
effexor for depression
buy flagyl 200mg pills – buy generic cleocin 300mg buy generic zithromax 250mg
diablo 4 controversy
amitriptyline brand name
depot aripiprazole
allopurinol how long to work
furosemide online buy – tacrolimus usa buy generic capoten online
does aspirin raise blood pressure
purchase glucophage for sale – order generic metformin buy lincomycin 500mg generic
You made some clear points there. I did a search on the subject matter and found most individuals will approve with your site.
weaning off bupropion
baclofen 10 mg precio
does celebrex contain aspirin
augmentin class
order clozapine generic – altace 5mg us buy pepcid 20mg sale
order retrovir 300 mg for sale – buy epivir buy allopurinol 100mg pill
buspirone hcl snorting
ashwagandha pregnancy
is celecoxib a blood thinner
celexa weight gain
Great site. Plenty of useful info here. I’m sending it to some friends ans also sharing in delicious. And of course, thanks for your sweat!
clomipramine 25mg canada – purchase imipramine without prescription order sinequan 25mg pills
quetiapine 50mg price – buy bupropion for sale eskalith where to buy
Magnificent web site. A lot of useful information here. I’m sending it to some friends ans additionally sharing in delicious. And naturally, thank you to your effort!
buy hydroxyzine online – oral amitriptyline 25mg buy amitriptyline 10mg pills
buy amoxiclav pills – buy generic zyvox over the counter cipro ca
does abilify make you tired
cheap amoxil pill – order trimox 250mg without prescription baycip where to buy
seroquel lactose
semaglutide long-term side effects
acarbose instructions
repaglinide process
robaxin and tylenol
remeron doses for sleep
buy generic zithromax 250mg – buy ofloxacin 400mg generic order ciplox 500 mg pill
Very interesting points you have mentioned, thankyou for posting. “Ignorance, the root and the stem of every evil.” by Plato.
protonix 40mg
cost cleocin 150mg – buy oxytetracycline 250 mg online buy chloramphenicol no prescription
ivermectin dosage – ivermectin brand name buy cefaclor no prescription
buy albuterol online cheap – buy seroflo sale purchase theo-24 Cr online cheap
sitagliptin krka
medrol 4mg for sale – buy generic medrol online generic astelin 10 ml
warfarin synthroid
spironolactone yellow pill
Valuable info. Lucky me I found your site by accident, and I’m shocked why this accident did not happened earlier! I bookmarked it.
purchase desloratadine pill – order ketotifen 1mg generic buy albuterol inhalator for sale
Hi there! This post couldn’t be written any better! Reading through this post reminds me of my previous room mate! He always kept talking about this. I will forward this article to him. Pretty sure he will have a good read. Thank you for sharing!
voltaren gel 1% reviews
is venlafaxine addictive
tamsulosin halbwertszeit
micronase 5mg pill – glyburide 2.5mg price forxiga for sale
tizanidine diarrhea
Excellent website. A lot of useful info here. I’m sending it to several friends ans also sharing in delicious. And of course, thanks for your sweat!
zetia side effects mayo clinic
does wellbutrin cause panic attacks
zyprexa pregnancy
prandin 2mg tablet – pill empagliflozin buy jardiance 25mg generic
what is stronger zofran or phenergan
rybelsus us – order rybelsus for sale DDAVP us
I precisely had to say thanks once again. I do not know what I could possibly have handled without the type of creative ideas provided by you about my question. It seemed to be a frustrating case in my opinion, but noticing this well-written technique you processed that made me to cry over happiness. Now i am thankful for this service and even hope that you really know what a great job you’re putting in educating others all through your site. Probably you haven’t met any of us.
can you overdose on zyprexa
lamisil price – order griseofulvin online grifulvin v price