You might assume weak bones are a concern only for older adults, but bone strength starts to decline much earlier than most people realise. Often, the first sign that something is wrong comes after a simple fall results in a fracture. Every year, around 50,000 such incidents occur in the UK, and for many, the real shock comes later, when they are told they have osteoporosis, the bone-thinning condition that weakens the skeleton. An estimated 3.5 million people live with it, while another million have osteopenia, a mild form of bone loss that increases the likelihood of painful and sometimes life-changing fractures.What Is Osteoporosis?Osteoporosis is a condition that causes bones to become weak and brittle. It reduces bone density, making them thinner and more fragile. People with this condition are much more prone to fractures, even from minor falls or bumps.Healthy bones are normally dense and strong enough to bear weight and cushion impact. But as we age, they naturally lose some of their strength and ability to rebuild themselves. When osteoporosis sets in, this process speeds up, leaving bones weaker and far more likely to break. Most people are unaware they have it until a fracture reveals the damage already done.Daily Habits That Might Be Weakening Your BonesHormone specialist Dr Nicky Keay, Honorary Clinical Lecturer at University College London and author of “Myths of Menopause,” explains, “Your skeleton gives your body structure and stability, protects vital organs, and works with muscles to enable movement.” Bones also store essential minerals such as calcium, phosphorus, and magnesium, and the marrow inside certain long bones produces red and white blood cells.Below are some everyday habits that could be slowly draining your bone strength, and how to counter them.Dieting: Repeated cycles of losing and regaining weight can harm your bone density,” says dietitian Lorna Cooke from the Sports Institute of Northern Ireland. “Restrictive eating can disturb hormone balance and deprive your body of calcium and other nutrients vital for bone health. When dietary calcium is lacking, the body draws it from bones, which weakens them over time.”What to do: “Losing weight gradually is safer for bones,” says Lorna. She further suggests sticking to regular, balanced meals so that your body stays nourished. This approach helps you keep the weight off in the long run without harming bone health.Lack of Vitamin D: “One of the main causes of osteoporosis is vitamin D deficiency,” says Dr Eamon Laird, vitamin D researcher at Trinity College Dublin. “This ‘sunshine vitamin’ is produced when sunlight hits the skin, but during winter, we can’t make enough of it in northern climates.” Because diet alone doesn’t supply sufficient vitamin D, supplementation is often necessary.What to do: Nutritionist Rob Hobson from Healthspan advises, “Adults should take at least 10 µg of vitamin D daily during winter, and year-round if they’re over 65, spend little time outdoors, or have other risk factors.”Menopause Matters: Falling oestrogen levels after menopause accelerate bone loss, particularly the hormone oestradiol, which normally helps slow the breakdown of bone tissue. Women can lose around 0.5% of bone density each year after menopause, and by their mid-40s, many already have significant bone reduction.What to do: Consultant Gynaecologist Tania Adib from The Medical Chambers Kensington recommends, “Women around 45 should have a DXA scan to assess bone density. Building bone strength early and maintaining it through menopause is crucial. Focus on weight-bearing exercise, proper sleep, and a balanced diet.” In some cases, HRT can help prevent bone loss, especially in women experiencing early menopause or severe symptoms.Ultra-Processed Foods: Strong bones depend on diets rich in calcium and vitamin D, said Rob Hobson. “A diet full of ultra-processed foods lacks the essential nutrients needed for bone strength. These foods often provide excess calories but very few vitamins and minerals.”What to do: Cut back on ultra-processed foods and cook more from fresh ingredients. A balanced diet that includes wholegrains, lean proteins, fruits, vegetables, and healthy fats ensures your bones get the nourishment they need at every stage of life.Long-Term Medicines or Illness: Certain conditions, like an overactive thyroid, can increase the rate at which bones lose density. A guide by Viridian Nutrition and GP Dr Siobhan Brennan, notes that some weight-loss drugs, steroids, cancer treatments, antidepressants, and proton-pump inhibitors can also affect bone strength.What to do: Speak with your doctor or pharmacist about reviewing your medication. Ditching Dairy Products: Dairy products like milk, yogurt, and cheese are excellent sources of calcium, said Lorna. She further told us, “Cutting them out, whether due to veganism or dietary restrictions, can reduce calcium and vitamin D levels, raising the risk of osteoporosis.”What to do: Adults need about 1,000 mg of calcium daily. “If you don’t consume dairy, replace it with fortified foods such as plant-based milks or breads, calcium-rich greens, tofu, nuts, seeds, dried fruit, and pulses,” says Lorna. Gut Diseases: Conditions like Crohn’s disease or colitis can damage the intestine, impairing the absorption of key nutrients such as calcium and vitamin D,” Lorna explains. If untreated, this can eventually lead to osteoporosis.What to do: Early diagnosis and, if necessary, a specialist diet guided by a dietitian can help the gut heal and absorb nutrients again. Calcium and vitamin D supplements may be prescribed, and a bone scan at diagnosis is a good preventive step.Too Much or Too Little Exercise: Exercise plays a crucial role in maintaining bone health, but both inactivity and overtraining can cause harm. “Most people do too little, which increases their risk of brittle bones—even in their 30s or 40s,” says Dr Laird.What to do: Aim for at least 30 minutes of physical activity daily, advises Dr Laird. Include weight-bearing exercises, like walking or jogging, which help keep bones strong and resilient.