Eating patterns, activity and sleep

Three lifestyle factors with genuine evidence behind them, and a great deal of noise around them.

Dietary patterns

Mediterranean-style eating has the strongest evidence base for metabolic outcomes — improvements in insulin sensitivity, lipids, liver fat and cardiovascular risk. Vegetables, legumes, whole grains, fish, olive oil, nuts, with less red and processed meat.

Lower-carbohydrate approaches improve glucose control and liver fat for many people. They suit some well and others poorly, and they interact with diabetes medication — so they need discussion with your practitioner rather than self-implementation if you're on treatment.

Time-restricted eating shows benefits in some studies, though it remains unclear how much is independent of the reduced intake it usually produces. Reasonable if it suits you; not obviously superior.

Ultra-processed foods appear to affect intake and metabolic markers beyond what their nutrient composition predicts. Reducing them is among the more robust recommendations available.

Added sugar, and fructose specifically, is metabolised largely in the liver and contributes directly to liver fat. Sugar-sweetened drinks are the most concentrated common source.

Physical activity

Aerobic activity improves insulin sensitivity, cardiovascular fitness and liver fat — and does so independently of weight change, which matters for anyone who has struggled to lose weight.

Resistance training preserves muscle, improves glucose disposal and supports weight maintenance. The component most often neglected, and the more important one during active weight loss.

Reducing sedentary time has effects separate from structured exercise. Breaking up long sitting periods improves glucose handling.

The threshold for benefit is lower than people assume. Moving from nothing to something produces the largest proportional gain. Perfect adherence to guidelines isn't the entry requirement.

Sleep

The most neglected factor in metabolic health.

Short or disrupted sleep worsens insulin sensitivity, increases appetite-stimulating signalling and reduces satiety signalling — measurable within days in experimental studies.

Obstructive sleep apnoea is common in people with obesity and metabolic syndrome, frequently undiagnosed, and independently worsens insulin resistance and blood pressure. Loud snoring, witnessed pauses in breathing, waking unrefreshed or daytime sleepiness are all worth raising with your GP — treating it can improve metabolic markers directly.

Shift work carries elevated metabolic risk through circadian disruption. Not always avoidable, but worth accounting for.

Related: Insulin resistance · Nutrition during weight management Next: Find a GP or exercise physiologist →