Connect with us

INTERNACIONAL

Cuáles son las causas científicas detrás de la aparición temprana de canas, según especialistas de Harvard

Published

on


Expertos revelan cómo el estrés, la genética y la salud influyen en la pérdida de pigmento capilar (Imagen Ilustrativa Infobae)

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.

Advertisement

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.

Las canas no son exclusivas
Las canas no son exclusivas de la vejez: factores clave según Harvard – (Imagen Ilustrativa Infobae)

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.

Advertisement

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.

El ciclo de los folículos
El ciclo de los folículos pilosos y su impacto en la pigmentación del cabello (Imagen Ilustrativa Infobae)

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.

Advertisement

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.



canas

Advertisement
Advertisement

INTERNACIONAL

Un hombre atropelló y apuñaló a cuatro personas en Manchester en pleno Yom Kipur: hay dos muertos

Published

on


Un hombre atacó a varias personas frente a una sinagoga de Manchester y dejó un saldo de al menos dos muertos y dos heridos en plena celebración de Yom Kipur, la fecha más sagrada del calendario judío.

El agresor fue abatido por la policía. Sin embargo, las autoridades aún no pudieron confirmar su muerte debido a problemas de seguridad relacionados con objetos sospechosos.

Advertisement

Leé también: Israel interceptó la flotilla de más de 40 barcos con la que Greta Thunberg buscaba llegar a la Franja de Gaza

Según informó la policía del Gran Manchester, el ataque ocurrió cerca de las 9:30 de la mañana, cuando un testigo alertó sobre un vehículo que atropelló a varias personas y luego un hombre apuñaló a un agente de seguridad.

El ataque ocurrió en la fecha más sagrada del calendario judío. (Foto: AFP/Paul Currie).

Advertisement

La reacción de la policía y el contexto del ataque

La policía calificó el episodio como un ataque terrorista. El alcalde del Gran Manchester, Andy Burnham, aseguró que “el peligro inmediato parece haber pasado” y pidió a la población “no especular en las redes sociales”. Además, felicitó a las fuerzas de seguridad por su rápida intervención.

El ataque ocurrió mientras los fieles judíos acudían a la sinagoga para orar por Yom Kipur, una jornada de recogimiento y reflexión. El hecho conmocionó a la comunidad local y generó preocupación por la seguridad en un día tan especial.

La policía investiga el ataque como atentado terrorista. (Foto: REUTERS/Phil Noble).

La policía investiga el ataque como atentado terrorista. (Foto: REUTERS/Phil Noble).

El impacto político y las repercusiones

El primer ministro británico, Keir Starmer, expresó su horror por lo sucedido y decidió acortar su participación en la cumbre europea de Copenhague para regresar al país. “Estoy horrorizado por el ataque a la sinagoga de Crumpsall. El hecho de que esto haya ocurrido en el día de Yom Kipur, el día más sagrado del calendario judío, hace que sea aún más horrible”, escribió en la red social X.

Advertisement

Leé también: Nicolás Maduro celebró la Navidad adelantada con un show de fuegos artificiales en El Helicoide

El primer ministro agregó que “se están desplegando recursos policiales adicionales en las sinagogas de todo el país”. “Haremos todo lo posible para mantener a nuestra comunidad judía segura”, agregó.

El ataque se produjo a pocos días del tercer aniversario del atentado mortal de Hamas en el sur de Israel, el 7 de octubre de 2023, que dejó 1219 muertos, en su mayoría civiles.

Advertisement
Al menos dos personas murieron en el ataque. (Foto: REUTERS/Phil Noble).

Al menos dos personas murieron en el ataque. (Foto: REUTERS/Phil Noble).

El rey Carlos dijo que él y la reina estaban “profundamente conmocionados y entristecidos al enterarse del horrible ataque en Manchester, especialmente en un día tan significativo para la comunidad judía”.

“Nuestros pensamientos y oraciones están con todos aquellos afectados por este terrible incidente y agradecemos enormemente las rápidas acciones de los servicios de emergencia”, agregó.

La embajada de Israel en el Reino Unido condenó el ataque, al que calificó de “aborrecible y profundamente angustiante”.

Advertisement

Un día de oración marcado por la violencia

Yom Kipur es una de las fechas más importantes para la comunidad judía, en la que los creyentes suelen acudir a la sinagoga para rezar y pedir perdón. El ataque en Manchester tiñó de miedo y dolor una jornada que debía ser de paz y reflexión.

Un aumento del antisemitismo en el Reino Unido

La organización de monitoreo y seguridad comunitaria Community Security Trust (CST) afirmó que en los 12 meses posteriores a los atentados del 7 de octubre, se registraron 5583 incidentes en el Reino Unido, incluyendo comportamiento abusivo, amenazas, agresiones, daños y profanación, lo que representa un aumento interanual del 204 %.

En 2024, se reportaron 3528 incidentes antisemitas en el Reino Unido, la segunda cifra más alta, según el CST. “El impacto duradero del conflicto en Oriente Medio en el discurso antijudío en el Reino Unido es evidente en el hecho de que la retórica relacionada con el conflicto estuvo presente en 1.844 (52%) de los 3528 incidentes antisemitas reportados al CST en 2024, junto con lenguaje, motivación u objetivos antijudíos”, afirmaron.

Advertisement

Reino Unido, Manchester, antisemitismo

Continue Reading

INTERNACIONAL

UK attack outside synagogue leaves 2 dead, 3 injured, police say

Published

on


NEWYou can now listen to Fox News articles!

At least two victims have died and three others are in a serious condition after a car and knife attack outside a synagogue in Manchester in the United Kingdom, authorities said.

Advertisement

Greater Manchester Police said officers were called at about 9:30 a.m. to the Heaton Park Hebrew Congregation Synagogue after a vehicle was driven into pedestrians and at least one person was stabbed. Armed police declared a major incident and opened fire minutes later, striking a person believed to be the suspect.

Police said they cannot currently confirm if the suspect is dead due to safety issues surrounding suspicious items on his person. The bomb disposal unit has been called and is now at the scene.

Emergency services at the scene of a stabbing at Heaton Park Hebrew Congregation synagogue, in Crumpsall, Manchester, England, on Thursday Oct. 2, 2025. (Peter Byrne/PA via AP)

Advertisement

MULTIPLE PEOPLE KILLED IN SHOOTING ATTACK ON JERUSALEM BUS

Paramedics arrived at the scene minutes later and were seen treating the victims. 

Police declared «PLATO,» a national code-word used by police and emergency services when responding to a «marauding terrorist firearms attack» or other large-scale incidents involving significant threats to public safety.

Advertisement

A large number of people were worshiping at the synagogue at the time of the incident. They were held inside while the immediate area was made safe but have since been evacuated, police said. 

The attack came on Yom Kippur, the holiest day in the Jewish calendar which ends later today. 

SHOOTING AT CAPITAL JEWISH MUSEUM HIGHLIGHTS RISING WAVE OF ANTI-JEWISH HATE CRIME

Advertisement

Andy Burnham, the mayor of Greater Manchester, said with a «degree of reassurance,» that the incident is now over.

«It is believed that the offender is deceased, although it’s not confirmed,» he told the BBC.

A Greater Manchester Police spokesperson acknowledged the significance of the timing of the attack. 

Advertisement

«We know today’s horrifying attack, on the Jewish community’s holiest day, will have caused significant shock and fear throughout all of our communities,» the spokesperson said in a statement. 

The spokesperson said a member of the public prevented the suspect from entering the synagogue.

Firefighters and paramedics respond outside Heaton Park Hebrew Congregation Synagogue in Manchester, England, Thursday, Oct. 2, 2025, after a car was driven into pedestrians and a man was stabbed. Police said four people were injured and the suspect was shot by officers.

Emergency services on scene after a car and knife attack outside Heaton Park Hebrew Congregation Synagogue in Manchester, England, Oct. 2, 2025. (Peter Byrne/PA via AP)

U.K. Prime Minister Keir Starmer is returning early from a visit to Denmark and will chair what he called an «emergency meeting» in London with cabinet ministers and officials.

Advertisement

Starmer said additional police assets are being deployed at synagogues across the country. 

Police officer in high-visibility jacket stands behind cordon near houses after Manchester synagogue attack.

A police officer secures the scene outside Heaton Park Hebrew Congregation Synagogue in Manchester, England, Thursday, Oct. 2, 2025, after a car and knife attack injured four people. Officers shot a man believed to be the suspect. (Paul Currie / AFP)

CLICK HERE TO GET THE FOX NEWS APP

«I’m appalled by the attack at a synagogue in Crumpsall,» Starmer wrote on X.

Advertisement

The fact that this has taken place on Yom Kippur, the holiest day in the Jewish calendar, makes it all the more horrific. My thoughts are with the loved ones of all those affected, and my thanks go to the emergency services and all the first responders.»

The Associated Press contributed to this story.

Advertisement



united kingdom,crime world,world,religion,judaism

Advertisement
Continue Reading

INTERNACIONAL

Federal government shutdown sparks blame game in crucial race for governor

Published

on


NEWYou can now listen to Fox News articles!

MADISON, N.J. – EXCLUSIVE: The nation’s capital isn’t the only battlefield in the blame game between Democrats and Republicans over the first federal government shutdown in seven years.

Advertisement

The verbal crossfire is also playing out on the campaign trail in New Jersey, which is home to one of only two elections for governor across the nation this year.

Republican gubernatorial nominee Jack Ciattarelli, in an exclusive national interview with Fox News Digital, pointed fingers at his Democratic rival, Rep. Mikie Sherrill.

After Sherrill, a four-term congresswoman, charged in a statement that «Washington Republicans have once again shown they’re willing to turn their backs on the American people in order to blindly follow Donald Trump’s demands,» Ciattarelli criticized his opponent in the combustible, competitive, and high-profile ballot box showdown.

Advertisement

FIVE RACES TO WATCH WITH FIVE WEEKS TO GO UNTIL ELECTION DAY 2025

Jack Ciattarelli, the Republican nominee for governor in New Jersey, takes part at a candidate forum at Fairleigh Dickinson University, on Oct. 1, 2025 in Madison, N.J.  (Paul Steinhauser – Fox News)

«There’s nothing my opponent won’t blame on President Trump. As I like to say, if you get a flat [tire] today, it’s President Trump’s fault,» Ciattarelli argued, in a sit-down interview after taking part in a candidate forum hosted by Fairleigh Dickinson University.

Advertisement

With neither Trump and the Republican majority in Congress, nor congressional Democrats willing to lower the temperature, the government shut down early Wednesday morning.

BLAME GAME OVER SHUTDOWN INTENSIFIES 

Democrats insisted that any agreement to prevent a government shutdown, or now to end the shutdown, must extend tax credits for the Affordable Care Act (ACA) beyond the end of this year. Those credits, which millions of Americans rely on to reduce the costs of health care plans under the ACA, which was once known as Obamacare, are set to expire unless Congress acts.

Advertisement

But most Republicans oppose the extension of the credits and argue that the Democrats’ demands would lead to a huge increase in taxpayer-funded healthcare for immigrants who entered the country illegally.

Sherrill, along with every other House Democrat except Rep. Jared Golden of Maine, voted against a GOP stopgap measure that would have temporarily averted the shutdown.

Closed sign at the National Archives during federal government shutdown

A closed sign stands in front of the National Archives on the first day of a government shutdown, Wednesday, Oct. 1, 2025, in Washington.  (Julia Demaree Nikhinson – AP Photo)

Ciattarelli, pointing to his rival’s vote in Congress, said, «I do know that there’s a bipartisan group of congresspeople that are trying to keep the government open. My opponent has decided not to be part of that bipartisan group, and she voted no. And so here we are.»

Advertisement

Sherrill, who has repeatedly linked Ciattarrelli to Trump, placed the shutdown blame squarely on Trump’s shoulders, writing in a social media post, «This is precisely the extreme MAGA agenda that @Jack4NJ wants to bring to NJ.»

TRUMP LOOMS LARGE OVER THIS CRUCIAL RACE FOR GOVERNOR

And taking aim at congressional Republicans in a statement from her House office, Sherrill argued that «instead of working with Democrats to lower costs, protect health care, and support working people, Washington Republicans bent the knee to Donald Trump, shutting down the government in the process.»

Advertisement
Rep. Mikie Sherrill of New Jersey appears during a gubernatorial debate.

Democratic gubernatorial nominee Rep. Mikie Sherrill of New Jersey responds to questions during the first general election debate with Republican opponent Jack Ciattarelli. Sunday, Sept. 21, 2025, in Lawrenceville, N.J.  (AP Photo/Noah K. Murray)

With just over one month to go until Election Day in New Jersey — and early voting taking place Oct. 25-Nov. 2 — a new Fox News poll indicated Sherrill holding an upper single-digit lead over Ciattarelli.

But Ciattarelli, a former state lawmaker and a certified public accountant who started a medical publishing company before getting into politics, touted that «the energy is off the charts, and the fact that I’m being endorsed by Democratic mayors around the state says a whole lot about people wanting change here in the state of New Jersey.»

Hours into the shutdown, the Trump administration announced the freezing of billions of dollars in federal funding for two infrastructure projects, including the Gateway Project, which would build a new train tunnel under the Hudson River connecting New Jersey and New York.

Advertisement

Sherrill quickly slammed the move and pointed fingers at Ciattarelli. She pledged to «fight tooth and nail to complete this essential infrastructure project for New Jersey. Jack Ciattarelli will not. He’s refused to name a single area where he disagrees with Trump.»

But Ciattarelli campaign senior strategist Chris Russell shot back in a statement, saying, «Make no mistake, Mikie Sherrill owns this shutdown and is responsible for any negative impacts on [the] Gateway tunnel project and other NJ priorities.»

HEAD HERE FOR FOX NEWS’ 2025 ELECTION COVERAGE

Advertisement

The two candidates will face off next week in their second and final debate before voters head to the polls in the election to succeed term-limited Democratic Gov. Phil Murphy.

Asked about his debate game plan, Ciattarelli said he would «be very, very specific with policy proposals that fix our problems here in New Jersey, and point out every single time she doesn’t answer the questions.»

mikie sherrill and jack ciattarelli

Republican candidate Jack Ciattarelli, left, shakes hands with Democratic candidate for governor Mikie Sherrill, right, before a debate on Sunday, Sept. 21, 2025, in Lawrenceville, N.J.  (AP Photo/Noah K. Murray)

Gubernatorial candidates in New Jersey run on a party ticket and Democrats on Wednesday were spotlighting a comment by the GOP lieutenant governor nominee Jim Gannon, the Morris County Sheriff, in a debate earlier this week that «taxes are on the table.»

Advertisement

Asked about his running mate’s comment, Ciattarelli emphasized that «there will be no tax increases under Governor Ciattarelli. And I would put forth a very specific plan on how to decrease the income tax and the property tax here in New Jersey.»

The race was rocked last week after a New Jersey Globe report revealed that Sherrill’s military records indicated that the United States Naval Academy blocked her from taking part in her 1994 graduation amid the cheating scandal.

Sherrill claims that Ciattarelli is going on a «witch hunt» over her improperly released military records, which raised questions about her possible involvement in a cheating scandal that rocked the U.S. Naval Academy three decades ago.

Advertisement

«He has been caught with his hand in the cookie jar, if you will. He’s now trying to divert from that,» Sherrill told reporters on Tuesday following a campaign event in Wildwood Crest, New Jersey.

Ciattarelli and his campaign are calling on Sherrill, who went on to pilot helicopters during her military career after graduating from the Naval Academy, to release her military records to explain why she was prevented from attending her graduation ceremony.

But a separate report from CBS News revealed that the National Personnel Records Center, which is a branch of the National Archives and Records Administration, mistakenly released Sherrill’s improperly redacted military personnel files, which included private information like her Social Security number, to a Ciattarelli ally. 

Advertisement

«To have a guy I’m running against, it will stop at nothing, it will stop at nothing, who will illegally obtain records. It’s just beyond the pale,» Sherrill, who served as a federal prosecutor before winning election to Congress, charged last week.

The National Archives, in a letter last week, apologized to Sherrill, saying the improper release was due to a government worker’s error over a legal records request.

Following the breach of the records, Sherrill’s campaign sent cease-and-desist letters to the National Archives and to Ciattarelli’s campaign, as well as to Ciattarelli’s top strategist, Chris Russell and Nicholas De Gregorio, who is described by Sherrill’s team as «an agent of the campaign working at the direction of» Russell.

Advertisement

The Sherrill campaign on Monday launched a digital ad taking aim at Ciattarelli.

«They broke the law to attack a veteran,» the narrator in the spot charged.

CLICK HERE TO GET THE FOX NEWS APP

Advertisement

Asked about the ad, Ciattarelli charged in his Fox News Digital interview that Sherrill «did something at the Naval Academy that caused them to punish her. She wasn’t allowed to participate in the graduation. Her name is not listed in the commencement exercise program. She was, in fact, punished. She needs to come clean on what she did to be punished by the Naval Academy.»

And asked about the release of her military files and criticism from Democrats of possible dirty tricks, Ciattarelli said «somebody filed a Freedom of Information Act request, and it was fulfilled by the National Archives. And so it’s all a smokescreen. The information that came out of there is what the National Archives provided, but this is a smokescreen and spin on what really took place at the Naval Academy, and that’s her punishment.»

Advertisement

government shutdown,governors,gubernatorial,elections,2025 2026 elections coverage,new jersey,donald trump,campaigning

Advertisement
Continue Reading

Tendencias