Pfizer’s Covid vaccine may be less effective if you’re fat, a study has warned.

Italian researchers said obese people make half as many antibodies – proteins that attack the virus.

It may be because their fat hampers their immune system, which is involved in making antibodies.

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Extra weight can cause long-term inflammation, which sabotages the immune system and makes it less able to fight infection.

Obesity, defined as a BMI over 30, has already been shown to be a risk factor for severe Covid and death, prompting health officials to warn the public to drop some pounds.

But the exact reasons have not been clearly explained.

Read more at The Sun.