Kelly Osbourne has opened up about the dramatic weight loss she experienced following the death of her father, rock legend Ozzy Osbourne, saying she did not realise how much weight she had lost until she saw a photograph of herself.

In an interview with The Mail on Sunday, the 41-year-old said she was experiencing such intense grief that she struggled to recognise what was happening to her physically. She recalled seeing a photograph taken while she was preparing for the 2026 Grammy Awards and being shocked by how thin she appeared.

'I couldn't see what other people saw because I was in so much pain,' Osbourne said.

She also explained that her appetite was affected by grief, saying she was so consumed by pain that 'the feeling of hunger' did not come up. Ozzy Osbourne died in July 2025 at the age of 76.

While major weight changes can sometimes follow periods of emotional distress, unintentional weight loss should not automatically be dismissed as stress or grief.

When Is Weight Loss Concerning?

Unintentional weight loss means losing weight without deliberately changing your diet or exercise routine. The NHS says it can sometimes be linked to stress or bereavement, but it can also be a symptom of an underlying health condition.

Possible causes range from depression, anxiety, and eating disorders to digestive conditions, an overactive thyroid, type 1 diabetes, and heart failure. Some medicines can also affect appetite or weight. In some cases, unexplained weight loss can be associated with cancer, which is why persistent changes should be checked by a GP.

There is no single amount of weight loss that means something is definitely wrong. However, losing 5% to 10% of body weight unintentionally over three to six months is considered one of the main signs of malnutrition, according to the NHS.

For example, someone weighing 70kg who unintentionally loses 3.5kg to 7kg over several months would fall within that range.

What Other Signs Should You Watch For?

Weight loss becomes more concerning when it occurs alongside other changes.

These can include a persistent lack of appetite, ongoing tiredness, weakness, feeling cold, poor concentration, low mood, or becoming ill more frequently. These are among the symptoms the NHS lists in relation to malnutrition.

Digestive symptoms, changes in bowel habits, excessive thirst or urination, persistent pain, or other unexplained symptoms may also warrant medical assessment.

Importantly, someone does not necessarily have to appear underweight to be malnourished. The NHS notes that a person can have a healthy weight or even be overweight while still not getting enough essential nutrients.

When Should You See a Doctor?

The NHS recommends speaking to a GP if you continue losing weight without making changes to your diet or exercise routine. It is particularly important to seek medical advice when weight loss is accompanied by other symptoms.

A GP can review changes in weight, appetite, mood, medications, and other symptoms and decide whether further tests are needed.

Osbourne's experience also highlights how emotional distress can affect physical health. Bereavement can disrupt appetite and daily routines, and seeking support during an especially difficult period is not a sign of weakness.

For anyone experiencing unexplained or significant weight loss, the key message is simple: do not assume it is harmless simply because you feel stressed or have recently experienced a major life event. Getting the cause checked can help ensure that any underlying problem is identified and treated as early as possible.

Frequently Asked Questions

  • What is unintentional weight loss?
    Unintentional weight loss is losing weight without deliberately changing your diet or exercise routine.
  • When should I be concerned about weight loss?
    You should be concerned if you lose 5% to 10% of your body weight over three to six months without trying, especially if accompanied by other symptoms.
  • What are some possible causes of unintentional weight loss?
    Possible causes include stress, bereavement, depression, anxiety, eating disorders, digestive conditions, an overactive thyroid, type 1 diabetes, heart failure, and some medications.
  • When should I see a doctor about weight loss?
    See a GP if you continue losing weight without making changes to your diet or exercise routine, particularly if accompanied by other symptoms.
Read more