Understand your health.
Clear, evidence-informed insights on nutrition, energy, sleep, gut health, hormones, healthy ageing and the science behind emerging approaches to health.
We look at the research, explain what it means, and distinguish between what is well established and what is still developing.
We label the strength of the evidence as we go: What we know for well-established findings, What may help for promising or mixed evidence, and What we don't yet know where evidence is limited.
Living longer and living well: what healthy life expectancy means
In the UK, healthy life expectancy at birth is 60.7 years for males and 60.9 years for females (ONS, 2022 to 2024). What those figures mean, and why they are not a personal prediction.
Last updated 29 September 2026Read the articleSleep and food: the basics that matter
The basics with good evidence behind them, and where the evidence is thinner.
Last updated 1 October 2026Read the articleUnderstanding cardiometabolic risk
Blood pressure, cholesterol and blood sugar: what the numbers mean together.
Last updated 29 September 2026Read the articleWhy strength matters more with age
What the UK activity guidelines recommend, and how to start safely.
Last updated 1 October 2026Read the articleHow to judge claims about tests and supplements
Six questions to ask before you pay for a test or supplement.
Last updated 29 September 2026Read the articleThe NHS is moving from sickness to prevention
What the 10 Year Health Plan for England says about prevention, and what it means for individuals.
Last updated 1 October 2026Read the articleThe gut microbiome: what we know and what we don't
Microbiome research, home tests and probiotics, sorted by strength of evidence.
Last updated 29 September 2026Read the articleFibre and the gut
The 30g a day recommendation, how to get there comfortably, and when the advice differs.
Last updated 29 September 2026Read the articleWhen digestive symptoms need checking
The symptoms the NHS says need a GP, urgent advice or emergency care.
Last updated 1 October 2026Read the articleWeight management: what the evidence supports
BMI, waist size, realistic change, keeping muscle and where medicines fit.
Last updated 1 October 2026Read the articleStart with a question
Brief answers to questions people often ask, with the sources we used. They are general information, not advice about your own health.
Why is it harder to lose weight after 40?
There is no single metabolic switch that makes weight loss impossible after 40. Changes in activity, muscle mass, sleep, hormones, diet, medication, health conditions and lifestyle can all influence weight and body composition.
Resting metabolic rate declines gradually with age, largely because muscle mass tends to fall unless it is maintained through resistance exercise. Sleep, stress, some medicines and conditions such as an underactive thyroid can also play a part. Weight should not be reduced to willpower, and not every difficulty is explained by hormones or a "slow metabolism".
References: NHS, Overweight and obesity in adults; NICE, Overweight and obesity management (NG246); NHS, Underactive thyroid.
What is metabolic health, and why does it matter?
Metabolic health describes how well the body manages blood glucose, blood fats and energy balance. It is usually assessed through measures such as blood glucose or HbA1c, blood pressure, cholesterol, waist circumference and physical activity.
It is not a single number. Poorer metabolic health increases the long-term risk of type 2 diabetes, cardiovascular disease and fatty liver disease, and many of the measures can improve with lifestyle change, and sometimes with treatment, when identified early.
References: NICE, Type 2 diabetes: prevention in people at high risk (PH38); British Heart Foundation, High cholesterol; Diabetes UK, What is HbA1c?.
How does fat around the middle affect long-term health?
Visceral fat, stored around the abdominal organs, is associated with higher cardiometabolic risk, including type 2 diabetes, cardiovascular disease, raised blood pressure and fatty liver. Waist circumference is a simple, useful guide.
Visceral fat tends to respond well to changes in diet and physical activity. Knowing about it is a reason for sensible action, not alarm.
References: NICE, Overweight and obesity management (NG246); NHS, Overweight and obesity in adults.
What causes weight change during perimenopause and menopause?
Weight change in midlife usually has several causes: hormonal changes, ageing, a shift in where fat is stored, reduced muscle mass, activity, sleep and lifestyle, with a lot of variation between individuals. Menopause does not automatically cause weight gain, and HRT is not a weight-loss treatment.
Falling oestrogen is associated with fat being stored more around the abdomen. Evidence on whether HRT directly affects weight is mixed, so individual clinical advice matters more than general claims.
References: Women's Health Concern (British Menopause Society), Weight gain and menopause factsheet; NICE, Menopause: identification and management (NG23).
Can poor sleep affect weight and metabolic health?
Sleep length and quality can influence appetite, energy, food choices and activity. Poor sleep is associated with changes in appetite hormones and more cravings for energy-dense food.
The evidence that improving sleep leads directly to weight loss is promising but not conclusive. Sleep is one supporting factor rather than a solution on its own.
References: NHS, Sleep and tiredness; Tasali E and others, Effect of sleep extension on energy intake among adults with overweight, JAMA Internal Medicine, 2022.
How do I keep muscle while losing weight?
Resistance exercise, enough protein, a sensible rate of weight loss and adequate overall nutrition all help to preserve strength during weight loss. Very rapid or severe calorie restriction increases the share of weight lost from muscle.
This matters beyond appearance, because muscle is closely tied to metabolic health, mobility and independence.
References: UK Chief Medical Officers' physical activity guidelines; NHS, Strength exercises; NICE, Overweight and obesity management (NG246).
What causes persistent bloating?
Bloating is common and has many possible causes, from eating patterns and constipation to IBS, coeliac disease and other conditions that may need investigation. Microbiome testing should not be treated as the automatic answer.
Evidence for microbiome-targeted products in resolving bloating is mixed. Some people benefit and many do not, and clinical assessment should come first.
References: NHS, Bloating; NICE, Irritable bowel syndrome in adults (CG61); Coeliac UK, Coeliac disease.
When should digestive symptoms be checked?
A persistent change in bowel habit, blood in your stool, unexplained weight loss, persistent abdominal pain or bloating, difficulty swallowing or persistent vomiting should be assessed by your GP. Severe or sudden symptoms need NHS 111 or emergency services without delay.
Most digestive symptoms are not serious, but proper assessment is the only way to know.
References: NHS, Symptoms of bowel cancer; NICE, Suspected cancer: recognition and referral (NG12).
What health checks should men consider after 40?
Blood pressure, cardiovascular risk, cholesterol, diabetes risk, waist measurement, lifestyle, family history and relevant screening are the foundation, with mental wellbeing and sexual health also worth considering. The NHS Health Check covers much of this for eligible adults aged 40 to 74.
Testosterone testing is relevant only where there is a clinical reason. Not every man over 40 needs an extensive hormone panel.
References: NHS Health Check; NICE, Cardiovascular disease: risk assessment and reduction (NG238); Prostate Cancer UK, Risk and symptoms.
Why am I tired all the time?
Tiredness has many possible contributors: sleep, stress, nutrition, iron deficiency, thyroid problems, hormonal change, metabolic health, medicines, inactivity and underlying illness. Persistent or unexplained tiredness should be assessed by a doctor rather than self-diagnosed.
It is common for no single clear cause to be found even after careful assessment. A good assessment can rule things in or out and guide next steps, but cannot always give a definite answer.
References: NHS, Tiredness and fatigue; NHS, Iron deficiency anaemia.
Want to talk through what you have read?
Speak to our team if you have a question, or start with a health assessment if you are ready to look at your health in more detail. We cannot give personal medical advice through this website.