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Cuáles son las causas científicas detrás de la aparición temprana de canas, según especialistas de Harvard
Las canas forman parte de la vida de muchas personas y suelen asociarse al envejecimiento, aunque también pueden presentarse en edades tempranas. Las últimas investigaciones científicas revelan que la edad no resulta el único factor involucrado en la pérdida del color capilar. El trabajo de especialistas estadounidense aporta precisión sobre cómo y por qué los cabellos adoptan tonos grises o blancos, alejando mitos y explicando fenómenos comunes.
Según expertos de Harvard, la clave de la aparición de las canas se encuentra en los folículos pilosos, donde se origina el crecimiento del pelo. Cada folículo cumple un ciclo determinado. Factores como decoloración, tinturas frecuentes o la propia caída del cabello interrumpen el ciclo natural y favorecen que la fibra capilar pierda la melanina responsable de su coloración.
De acuerdo con Robert H. Shmerling, médico del Centro Médico Beth Israel y miembro de la Facultad de Medicina de Harvard, los folículos pilosos envejecen con el tiempo. Este proceso afecta su capacidad para mantener la pigmentación. “Las canas aparecen a medida que envejecen los folículos pilosos, que son los encargados del crecimiento y la pigmentación. Cuando llegan a su vejez, el pelo pierde progresivamente la intensidad en su color”, explicó Shmerling a Marie Claire.
El ciclo del folículo piloso obedece no solo al paso de los años, sino también a estímulos externos. Estrés, agotamiento y burnout (agotamiento profesional) representan factores de importancia, ya que aceleran la caída y la regeneración del cabello. Según los especialistas de Harvard, el estrés persistente puede adelantar la primera aparición de canas en personas jóvenes. Shmerling señaló: “Es el culpable de que cuando nace un nuevo pelo salga con un tono más grisáceo. Ya hemos visto que el estrés puede hacer que se nos caiga más rápido el pelo y, al regenerarse, aumente la probabilidad de que difiera de nuestro tono original”.
La recomendación de los expertos es reducir los niveles de agotamiento y evitar situaciones prolongadas de alta presión. Esta práctica protege los ciclos de crecimiento capilar y contribuye a mantener la melanina durante más tiempo, lo que retrasa la llegada de las canas.
Las causas no se limitan a los procesos fisiológicos ni al entorno emocional. De acuerdo con los investigadores, la genética desempeña un papel fundamental. Algunos genes heredados pueden determinar cuándo comenzarán a apreciarse los cabellos blancos o grises. Esto significa que, aunque se lleve un estilo de vida saludable y se controle el estrés, la carga genética puede incidir de forma inevitable.
Además, existen afecciones médicas específicas que aumentan la probabilidad de aparición de canas a edades tempranas. El informe menciona la deficiencia de vitamina B12, la esclerosis tuberosa, la neurofibromatosis, el vitíligo, los trastornos tiroideos y la alopecia areata como enfermedades asociadas a la reducción o ausencia de pigmentación capilar.
Enla actualidad, la percepción social sobre las canas cambió de manera notable. De acuerdo con las tendencias recientes, existe una mayor aceptación y hasta orgullo de lucir el cabello en tonos grises o blancos. Según especialistas consultados por el medio, el estigma social que solía pesar sobre las canas, especialmente en las mujeres, disminuyó. El avance en la valoración de la belleza natural contribuyó a que cada vez más personas elijan no disimular la pérdida de pigmentación.
Aunque los productos como tinturas o tratamientos estéticos siguen disponibles, la conversación gira actualmente en torno a “llevar el cabello al natural”. Esto permite que quienes prefieren aceptar el paso del tiempo o las causas biológicas encuentren un espacio de validación y expresión de identidad.
La comunidad científica y médica hace hincapié en que la aparición de canas constituye un proceso biológico común, vinculado a la función de los folículos y a factores tanto internos como externos. Si bien resulta posible retrasar la despigmentación mediante ciertos cuidados, no existe una fórmula infalible para impedir totalmente la llegada de los cabellos blancos.
Por último, los especialistas insisten en que no debe asociarse la presencia de canas exclusivamente con la vejez ni considerarse motivo de vergüenza o preocupación. Aceptarlas como parte de la diversidad humana y comprender sus causas ayuda a combatir estigmas de larga data. Queda en cada persona la decisión sobre cómo abordar su imagen, ya sea optando por técnicas para cubrirlas o aceptando su aparición natural.
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Israeli military arrests Greta Thunberg, flotilla activists after intercepting dozens of boats
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Israeli naval forces intercepted 39 vessels from a Gaza-bound aid flotilla on Thursday, detaining dozens of activists — including international climate activist Greta Thunberg and several European lawmakers, The Associated Press reported.
The Global Sumud Flotilla, which set out across the Mediterranean with more than 40 boats carrying about 500 activists, was the largest yet to attempt to break Israel’s blockade of the enclave, according to the AP.
The flotilla has since been reduced to a single vessel still headed toward Gaza. Organizers with the Global Sumud Flotilla said on X that the boat was last tracked only a few miles off Gaza’s coast before contact was lost. Activists told the AP that they believed the flotilla’s size would make it harder for Israeli forces to intercept every vessel.
Photos and surveillance footage captured the moment Israeli soldiers in helmets and night vision goggles boarded the flotilla. A photo from Israel’s foreign ministry showed Thunberg, the most prominent of the flotilla’s passengers, accompanied by soldiers following the interception. Israeli officials said those detained included Thunberg, former Barcelona Mayor Ada Colau and European Parliament member Rima Hassan, according to the AP.
ISRAEL CLAIMS GRETA THUNBERG’S FLOTILLA SEEKING TO BREAK GAZA BLOCKADE HAS HAMAS TIES, CITES DOCUMENTS
Climate activist Greta Thunberg sits near an Israeli soldier after Israeli naval forces intercepted a Gaza-bound flotilla. (Israel’s Ministry of Foreign Affairs )
Israel’s foreign ministry said on X that the activists were «safe and in good health» and would be transferred to Israel to be deported to Europe.
«The Hamas-Sumud provocation is over,» the Israel’s foreign ministry said in a post on X Thursday. «None of the Hamas-Sumud provocation yachts has succeeded in its attempt to enter an active combat zone or breach the lawful naval blockade. All the passengers are safe and in good health. They are making their way safely to Israel, from where they will be deported to Europe.»
«One last vessel of this provocation remains at a distance,» the post added. «If it approaches, its attempt to enter an active combat zone and breach the blockade will also be prevented.»
ITALY’S MELONI SAYS GAZA FLOTILLA RISKS ESCALATION, COULD ‘BLOW UP’ POTENTIAL CEASEFIRE DEAL
Israeli forces stormed a Global Sumud Flotilla vessel on Oct. 2, 2025, as the boat attempted to sail toward Gaza. (Global Sumud Flotilla via AP)
News of the interception also drew condemnation and sparked demonstrations in cities including Rome, Naples, Istanbul, Athens and Buenos Aires, the AP said. Italy’s largest trade union announced a one-day general strike for Friday in protest, while more rallies were expected across the globe on Thursday, the outlet added.
Anti-Israel activists aboard the Global Sumud Flotilla, including climate activist Greta Thunberg, before the vessels were intercepted by Israeli forces. (Israel’s Ministry of Foreign Affairs)
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The flotilla is part of a series of international efforts to challenge Israel’s blockade, which has been in place since 2007 after Hamas took control of Gaza. Previous attempts by activist flotillas to break the blockade have largely failed and sometimes sparked deadly clashes, including during the 2010 Gaza Freedom Flotilla raid.
Israel Defense Forces (IDF) and the Global Sumud Flotilla did not immediately respond to a request for comment from Fox News Digital.
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INTERNACIONAL
El éxodo de la ciudad de Gaza está desbordando los esfuerzos de socorro, según las agencias de ayuda
Palestinos huyen hacia el sur de la Ciudad de Gaza el 24 de septiembre de 2025. En medio del ataque terrestre del ejército israelí contra la Ciudad de Gaza, la enorme afluencia de gazatíes que huyen hacia el sur ha sobrecargado aún más los servicios humanitarios, que, según organizaciones de ayuda, eran insuficientes incluso antes de la llegada de muchos miles más. (Saher Alghorra/The New York Times)Actitud
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Media bashes Trump admin messaging for pinning shutdown on Dems, White House fires back
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EXCLUSIVE: The White House responded to various reports that President Donald Trump’s administration is breaking federal law by including commentary that blames Senate Democrats for the government shutdown in out-of-office emails and letters furloughing federal employees.
A number of reports suggested that including partisan messaging in official emails and communication channels could be a violation of the Anti-Lobbying Act, which prevents federal funding from being used in lobbying efforts.
«The Trump Administration is committed to sharing the truth with the American people, and it’s simply a fact that the Democrats shut down the government,» White House spokeswoman Abigail Jackson told Fox News Digital. «Democrats opposed the clean CR that they supported just 6 months ago and 13 times under the Biden Administration because they want free health care for illegal aliens.»
President Trump’s White House denied claims that blaming Democrats for the shutdown breaks federal law. (Photo by Leon Neal/Getty Images)
WHITE HOUSE PREPARES FOR ‘IMMINENT’ FEDERAL LAYOFFS AFTER DEMOCRATS FORCE GOVERNMENT SHUTDOWN
«And now, the Democrats are upset the Administration is sharing the truth — they are desperately trying to lie to the American people because they know their shutdown is hurting families and workers around the country,» Jackson added. «Unfortunately for the Democrats, facts are facts.»
Atop the Department of Justice website, a red banner reads: «Democrats have shut down the government. Department of Justice websites are not currently regularly updated.»
Fox News Digital obtained a DOJ memo which was sent to all employees of the agency outlining the plan for furloughing federal employees in the event of a shutdown, stating DOJ «has contingency plans in place for executing an orderly shutdown of activities that would be affected by any lapse in appropriations forced by Congressional Democrats.»
The Department of Justice sent out an internal memo blaming Democrats for the shutdown and detailing what furloughing employees would look like. (DOJ)
JOHNSON SAYS SCHUMER HANDED TRUMP ‘KEYS TO THE KINGDOM’ WITH GOVERNMENT SHUTDOWN DECISION
«Unfortunately, Democrats are blocking this Continuing Resolution in the U.S. Senate due to unrelated policy demands,» the memo continues. «A funding lapse will result in certain Department activities ceasing due to a lack of appropriated funding, and designated pre-notified employees will be furloughed subject to certain laws and regulations.»
On visiting the Department of Housing and Urban Development (HUD) website, a pop-up appears on the center page reading that reads: «The Radical Left in Congress shut down the government. HUD will use available resources to help Americans in need.»
Reports also suggested that the administration may be in violation of the Hatch Act, a federal law that prevents tax dollars from being spent in a partisan or politically biased manner, as a result of the messaging.
The HUD website directs blame to Democrats for the government shutdown. (HUD)
SHUTDOWN EXPLAINED: WHO WORKS, WHO DOESN’T AND HOW MUCH IT COSTS
Legal expert Andrew Cherkasy, co-founder of Golden Law, Inc. and former Air Force JAG, told Fox News Digital that «the Hatch Act does not apply to the President or Vice President. It does apply to most other federal employees.»
«The law is intended to prohibit government officials from using their official authority to interfere with, or affect elections,» Cherkasky explained. «The President of the United States and his agents under his authority have an unquestionable constitutional right to speak directly to the American people about what is happening in their government and who is responsible for it.»
The Hatch Act, which was signed into law in 1939, is enforced by the U.S. Office of Special Counsel (OSC), and is also designed to keep federal employees from influencing or interfering with elections while working in any official capacity.
A demonstrator holds a sign protesting the government shutdown at the James V. Hansen Federal Building on Jan. 10, 2019, in Ogden, Utah. (Natalie Behring/Getty Images)
BLAME GAME: GOP SPOTLIGHTS ‘SCHUMER SHUTDOWN’ WHILE DEMS LASH OUT AT REPUBLICANS AHEAD OF 2026 MIDTERMS
«For years, unelected bureaucrats and left-leaning agencies openly leaked, editorialized, and interfered in policy debates without consequence,» Cherkasky told Fox. «The Hatch Act does not prohibit the President from holding democrats accountable for shutting down the government.»
The Biden Administration also partook in messaging that pushed certain legislation. Biden’s Office of Management and Budget issued a statement regarding the Right to IVF Act last June, stating: «When the Supreme Court overturned Roe v. Wade nearly two years ago, it paved the way for Republican elected officials’ extreme, out-of-touch agenda, which has eroded access to reproductive health care for families across the country.»
The Obama Administration issued similar messaging in 2013 specifically blaming Republicans for a government shutdown threat, saying «House Republicans are pushing the Government toward shutdown.»
The federal government entered a partial shutdown at midnight Wednesday morning after a bill that would fund the government through Nov. 21 failed in the Senate.
Senate Democrats pushed for Obamacare subsidies that were set to expire to be included in the legislation, and reportedly felt sidelined in negotiations surrounding government funding.
Senate Minority Leader Chuck Schumer, D-N.Y., attends a news conference about the government shutdown, Tuesday, Sept. 30, 2025, on Capitol Hill, in Washington. (AP Photo/Jacquelyn Martin) (AP Photo/Jacquelyn Martin)
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Despite a Republican majority in both the House and the Senate, the spending bill requires 60 votes to pass in the Senate, meaning some Democrat senators will need to break ranks with Minority Leader Chuck Schumer to prevent the bill from failing.
Preston Mizell is a writer with Fox News Digital covering breaking news. Story tips can be sent to Preston.Mizell@fox.com and on X @MizellPreston
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