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[159.127.163.22]) by mx.google.com with ESMTPS id 586e51a60fabf-2c86a875a20si7818735fac.243.2025.04.01.11.34.38 for (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 01 Apr 2025 11:34:39 -0700 (PDT) Received-SPF: pass (google.com: domain of bounce@email.nationalgeographic.com designates 159.127.163.22 as permitted sender) client-ip=159.127.163.22; Authentication-Results: mx.google.com; dkim=pass header.i=@email.nationalgeographic.com header.s=ep1 header.b=D+xG0LoG; spf=pass (google.com: domain of bounce@email.nationalgeographic.com designates 159.127.163.22 as permitted sender) smtp.mailfrom=bounce@email.nationalgeographic.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nationalgeographic.com DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=email.nationalgeographic.com; s=ep1; t=1743532478; bh=oDGpM1gYHzr4VPduKjgRe7mFgvuHbZEHRsMxbmkru4c=; h=List-Unsubscribe:List-Unsubscribe-Post:MIME-Version:Subject:From: To:Date:Content-Type; b=D+xG0LoG9FtXW9WM8DC00jRGTjW/df9KR3YILa5gnQGKw+/yZWjf5Ti1pWxVQ+roz hlhI/UPXmzHgK9JvJc5ATPXgiYc8m8w6Gw0fYCZWPhnUNH0olm4tw1Tb63HNLMZC8c /CA9F9ay++sqi6KWWBBsIGK5SPOVnYOYsoQPxkU0= Received: from [10.233.84.202] ([10.233.84.202:34086]) by pc1udsmtn2n14 (envelope-from ) (ecelerity 3.6.9.48312 r(Core:3.6.9.0)) with ECSTREAM id 7B/8A-64616-EB13CE76; Tue, 01 Apr 2025 18:34:38 +0000 List-Unsubscribe: , List-Unsubscribe-Post: List-Unsubscribe=One-Click Message-ID: MIME-Version: 1.0 Feedback-ID: d3d52327-e0d8-446e-a053-c3e13b13bc8f:51c703a2-b031-452b-88bb-2eceb83411f2:email:epslh1 X-NSS: d3d52327-e0d8-446e-a053-c3e13b13bc8f Reply-To: "ng@email.nationalgeographic.com" Subject: How much salt is too much? It's complicated. From: National Geographic Health To: sterlingwhg@gmail.com Date: Tue, 1 Apr 2025 18:34:38 +0000 Content-Type: multipart/alternative; boundary="-=Part.2d10261.9eb8e62e3cb5ff96.195f2a25196.dc074a695644040a=-" X-Spam-Status: No, score=-10.7 X-Spam-Score: -106 X-Spam-Bar: ---------- X-Spam-Flag: NO ---=Part.2d10261.9eb8e62e3cb5ff96.195f2a25196.dc074a695644040a=- Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=UTF-8 NATIONAL GEOGRAPHIC HEALTH
Plus, how do= microplastics harm humans? Also, when does old age begin=C2=A0and why you = may want to skip that nightcap before bed=2E ‌ ‌ &= zwnj; ‌ ‌ ‌ ‌ ‌ &zwn= j; ‌ ‌ ‌ ‌   ‌ ‌ ‌ ‌ ‌ ‌=  ‌ ‌ ‌ ‌ ‌ ‌&nb= sp;‌   ‌ ‌ ‌ ‌ ‌ ‌=  ‌ ‌ ‌ ‌ ‌ ‌&nb= sp;‌   ‌ ‌ ‌ ‌ ‌ ‌=  ‌ ‌ ‌ ‌ ‌ ‌&nb= sp;‌   ‌ ‌ ‌ ‌ ‌ ‌=  ‌ ‌ ‌ ‌ ‌ ‌&nb= sp;‌   ‌ ‌ ‌ ‌ ‌ ‌=  ‌ ‌ ‌ ‌ ‌ ‌&nb= sp;‌   ‌ ‌ ‌ ‌ ‌ ‌=  ‌ ‌ ‌ ‌ ‌ ‌&nb= sp;‌   ‌ ‌ ‌ ‌ ‌ ‌=  ‌ ‌ ‌ ‌ ‌ ‌&nb= sp;‌   ‌ ‌ ‌ ‌ ‌ ‌=  ‌ ‌ ‌ ‌ ‌ ‌&nb= sp;‌ 
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In toda= y=E2=80=99s newsletter: When it comes to salt, there can be too much of a g= ood thing=2E But how much salt i= s that, exactly? Plus, how do microplastics harm humans? Also, when does old= age begin and why you may want to skip that nightcap before bed=2E 
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PHOTOGRAPH BY JOZ= EF VACLAVIK, GETTY IMAGES
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<= a href=3D"https://email=2Enationalgeographic=2Ecom/T/v600000195f2a237e6ad2d= 746e9666b528/d3d52327e0d8446e0000021ef3a0bcca/d3d52327-e0d8-446e-a053-c3e13= b13bc8f?__dU__=3Dv0G4RBKTXg2GtTHJDsy7ii3waBSrIwMXGZJ7x_OARFKFQAIe3mwx22JG_r= 9Sy1LWLGyMVrrFIdudbYjwKGAKz6iTAgyV5XAM3SbSN-FzJU9XXpFWtSFRxbGw4nHcgLdnvWYAV= cbDlQyQtE1-NmUBscmA=3D=3D&__F__=3Dv0fUYvjHMDjRPMSh3tviDHXIoXcPxvDgUUCCPvXMW= oX_0JoZLAZABQF30xF0sKPois3VqfW5bf1WlfvPhqF6LHwNrM1q5q51hij2QR0pfK4t09Jx0kWH= tPhYL8LupmGhICHX3s5v210SjjtUJMkeVfXCutnoDyw5yy_V0sG1U8f4jlrsRHhUOcHBzIpXSO4= Q7f2q2UudTA-hNdKDgOtJnjcQR5xxSxcZXr9rn3ES3aDmHw4zmupBF9q3G-5ShRQI2BmtB0HJvo= 7-JWF_ke-CFmPLk8AMsohK19FCO5qpxQnpe_IiQcjB_cgOk6T8wnDqnDKP3fYmCdLnOJUVZvOC3= c1WuQUNdNr7GLPbhqM0Z7t7EFyUmxz8QcfGnZvY_QhYgYUjFGatIRiox-94Z7KMOUoXwU4gxhkc= Xa8vp1xEZ2hY2QVnSKsNk6jONG9T7oelvrHBcieHFYC_StshJiV-3QYxvF17YFXT0j4pQqAVE4G= lo5IQlExjnWj25XQAjQpYw2erddubc9K1rqpghIogUmAUNvdcpBW1Sr9WFpPtkZ62MaMiJk-Et9= vw=3D=3D" target=3D"_blank" rel=3D"noopener" style=3D"color: #000000; font-= weight: inherit; background: none; text-decoration: none;" data-link-id=3D"= 948697600f0f11f088bde3e17505886b">Ah, salt=2E Perhaps one of t= he most beloved condiments for good reason=2E It=E2=80=99s tasty, enhances = our food and is also an essential nutrient=2E
 
Yet salt can be = the source of serious diseases, like high blood pressure, when consumed in excess=E2=80=94whic= h is why you might be surprised to learn that scientists are locked in a bi= tter debate over how much salt i= s too much=2E The answer isn't as clear as you might think=2E&= nbsp;
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PHOTOGRAPH=   BY ALEXANDER STEIN, JOKER/ULLSTEIN BILD/GETTY IMAGES
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<= a href=3D"https://email=2Enationalgeographic=2Ecom/T/v600000195f2a237e6ad2d= 746e9666b528/d3d52327e0d8446e0000021ef3a0bcd2/d3d52327-e0d8-446e-a053-c3e13= b13bc8f?__dU__=3Dv0G4RBKTXg2GtTHJDsy7ii3waBSrIwMXGZJ7x_OARFKFQAIe3mwx22JG_r= 9Sy1LWLGyMVrrFIdudbYjwKGAKz6iTAgyV5XAM3SbSN-FzJU9XXpFWtSFRxbGw4nHcgLdnvWYAV= cbDlQyQtE1-NmUBscmA=3D=3D&__F__=3Dv0fUYvjHMDjRPMSh3tviDHXIoXcPxvDgUUCCPvXMW= oX_0JoZLAZABQF30xF0sKPois3VqfW5bf1WlfvPhqF6LHwIb6qSgFS8DyEXNr3M-Nxw1SyyRU1G= IBfHAmBGdOKufwI6itFtiSc4oEzUWxCiIUouFifykd-K0e9U1NTA0j4bM5eTWTj1XE2RtTiNeLt= MlhTsAY9yft30U0QCOo6sK1YgtOFG5yTGYCBkoPWAEN9HPmk9Ugdnt9o7F0RhGvPNjNjF6qVlFV= iVlRRbM26fLtLQSDJQF7jwmcXQIGPXg5rwLwK-eS3xl35m--QtkKXe4p-W10BVK2JJ85yuJjBNp= 88OgpytWvH7-xoS665IkKofroeoP0JlI5mp6vP2ArRNL2CuHzbAn-rADwcGFIs5XI8gxlnsyQGk= LWN-284EgTMIfMoP0XEOot04-3awbreRjGlpP23WTJaFfLWztKdCLkt3rBiGGBCkZWliAkS04ft= bTozjW6pgpl783RhjD7kaSWgps5krCzPR5UfoijRegy6zzCEKk86tTzz5VunanZCiS-VrK8WbnY= 6G7RY-P22AZUMqeRY1rpvNRlEwwhFrvEKR9z_neZhd5H" target=3D"_blank" rel=3D"noop= ener" style=3D"color: #000000; font-weight: inherit; background: none; text= -decoration: none;" data-link-id=3D"155a2cd00f1011f09418837bb6c750b6">PLAST= IC ALL OVER: As plastic waste proliferates around the world, a= n essential question remains unanswered: What harm, if any, does it = cause to human health?
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PHOTOGRAPH BY MAT= THIEU PALEY, NATIONAL GEOGRAPHIC IMAGE COLLECTION
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PHOTOGRAPH BY GRE= GOR LENGLER, LAIF/REDUX
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Sleep is vital for your brain health=E2=80=94think of it as a rinse cycle for your brain=2E But a st= udy suggests that common sleep a= ids may interfere with one of the mysterious processes that cl= ears out the brain=E2=80=99s molecular trash at night=2E
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ONE LAST THING: Having a nightcap before bed? You might want to rethink that=2E=2E=2E 

Today=E2=80=99s newsletter was edited and curated by Jennifer Baik an= d produced by Alisher Egamov=2E Did someone forward this to you? Sign up here to get this newsletter and more=2E 
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