Poor appetite in older adults predicts mobility loss, fastest when inflammation is also raised

Design

Prospective cohort analysis (Health ABC), up to 6 years

Population

3,073 community-dwelling adults aged 70 to 79

Primary outcome

Persistent lower-extremity limitation

Effect

Poor appetite adjusted HR 1.44 (95% CI 1.2 to 1.7); 40% vs 20% by 18 months

This analysis of the Health, Aging and Body Composition study followed 3,073 community-dwelling adults aged 70 to 79 for up to six years. At baseline, 12.6% reported a poor appetite. The outcome was persistent lower-extremity limitation: difficulty walking a quarter mile or climbing ten steps, reported twice six months apart.

Those with a poor appetite more often developed limitation (64% vs 47%) and had higher IL-6, TNF-α and CRP. After adjustment for demographics, chronic disease, mood, medications and sensory factors, poor appetite was associated with a 44% higher hazard of limitation (HR 1.44, 95% CI 1.2 to 1.7). By 18 months, 40% of those with poor appetite and 20% with good appetite had developed it. Those with both poor appetite and raised inflammatory markers declined fastest, half reaching limitation by about a year.

This is observational, and poor appetite may be a marker of illness that also causes decline. The study does not show that improving appetite prevents mobility loss.

In practice, a single question about appetite is cheap and may identify older adults who need a nutrition and function review before decline sets in.

• Ask older adults whether their appetite has been poor, at every routine review.
• Treat a poor appetite as a prompt to review weight, nutrition, mood, medicines and oral health.
• Assess walking and stair-climbing ability in those reporting poor appetite.
• Consider early referral for nutritional support and strength training.
• Look for treatable causes of inflammation and weight loss.

Why it matters

Poor appetite is often dismissed as part of ageing, yet here it marked people who lost mobility within months.

Don't overread it

This association does not show that improving appetite or reducing inflammation would prevent mobility loss.

The statistics, in plain English

A hazard ratio of 1.44 means the rate of developing mobility limitation was about 44% higher with poor appetite. Fine-Gray models account for people who die before developing the outcome. As an observational finding, it identifies risk; it does not show cause.

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