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New Scientist. Science news and long reads from expert journalists, covering developments in science, technology, health and the environment on the website and the magazine.

Senior women exercising at home

Health

How the immune system changes with age and why

We are gaining a better understanding of the effects of ageing on the immune system, with some surprising findings that it’s not all downhill after 65

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This image may not be used in educational posters ^BCell-mediated immune response,^b computer artwork. This type of immune response is most often used against intracellular pathogens, such as viruses. The viruses (gold) are phagocytosed (engulfed) by macrophage cells (green), a type of white blood cell. Fragments of viral protein (antigen) are displayed on the macrophage's surface. The antigen is recognised by a helper T lymphocyte (purple, centre and right), which secretes chemicals to activate other immune cells, including cytotoxic T lymphocytes (purple, left and bottom). The cytotoxic cells release chemicals that cause the macrophages to disintegrate and die, killing the viruses inside as well.

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How to tell if your immune system is weak or strong

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T-cells and brain cancer cell. Composite coloured scanning electron micrograph (SEM) of T-cells and an apoptotic brain cancer cell. T-cells are a component of the body's immune system. CAR T-cell therapy takes T-cells from a cancer patient's blood and modifies them to recognize a specific protein found on patient's tumor cells. When reintroduced to the patient the T-cells find and destroy the tumour cells. The newest form of CAR T-cell therapy, now in clinical trials, uses 'memory' T-cells which remain in the body after attacking the cancer. The hope is that memory T-cells may provide an active reservoir of cancer-killing cells capable of stopping further tumours. Magnification: x6000 at 10cm wide.

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How genetically engineered immune cells are beating some cancers

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The food and drink that really can boost your immune system

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MANILA, PHILIPPINES - AUGUST 19: Commuters are seen wearing face masks and face shields inside a bus on August 19, 2020 in Quezon city, Metro Manila, Philippines. President Rodrigo Duterte relaxed quarantine measures in the Philippine capital in a bid to boost the country's tanking economy despite having the most coronavirus cases in Southeast Asia. The Philippines' health ministry has so far confirmed 173,774 cases of the coronavirus, a third of which were recorded in the last two weeks. (Photo by Ezra Acayan/Getty Images)

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The sex differences that impact the strength of your immune system

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New York, New York - March 14, 2020: The movement and travel restrictions instituted in NYC are having significant economic impacts. A sign at a GNC reads

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Why do some people appear to have a naturally strong immune system?

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US proposes to ease blood donor restrictions on gay and bisexual men

Health

US proposes to ease blood donor restrictions on gay and bisexual men

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Previous studies have produced different results on the weight-loss benefits of fasting

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Only eating between 7am and 3pm helps people with obesity lose weight

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US hospitals are facing critically low supplies of liquid ibuprofen

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Health

US childhood obesity guidelines may rush the use of drugs or surgery

The American Academy of Pediatrics recommends intensive interventions to manage weight loss, including drugs and surgery – but it’s unclear whether they will reduce childhood obesity

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Taxing sugary drinks may not cut obesity as much as headlines claim

Analysis

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Preterm babies have a similar BMI at adolescence to peers born at term

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Health

The size of skin cancer cells may affect how they respond to treatment

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Health

A better understanding of PCOS offers fresh hope for new treatments

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