Keto can help some older adults lose weight and improve blood sugar, but it carries extra risks after 60 that make medical guidance important. Older adults are more likely to take medicines that need adjusting on a very low-carb diet, such as those for diabetes and blood pressure, and more likely to have kidney problems. They also need more protein to protect muscle, more fiber, calcium and vitamin D for bones and digestion, and enough fluid, all of which are harder to get on a strict keto diet. For many people over 60, a moderate lower-carb or Mediterranean-style diet with plenty of protein, vegetables and healthy fats offers most of the benefits with fewer risks. Talk to your doctor before starting.
Possible benefits for older adults
- Weight loss, which can ease pressure on joints and lower blood pressure.
- Better blood sugar control in people with type 2 diabetes or prediabetes, under medical supervision. Our article on keto and type 2 diabetes explains the medicine risks.
- Lower triglycerides and, for some people, higher HDL cholesterol.
- Less reliance on sugary and ultra-processed foods.
Many of these benefits come from losing weight and eating fewer refined carbohydrates, which can also be achieved with less restrictive diets.
Risks to consider after 60
Medicines
Cutting carbs quickly can make blood sugar fall too low in people taking insulin or sulfonylureas, and some diabetes medicines (SGLT2 inhibitors) carry a risk of ketoacidosis on very low-carb diets. Blood pressure can also drop, especially with diuretics or other blood pressure medicines, causing dizziness and falls. Your doctor may need to adjust doses before you start.
Muscle loss
Muscle mass naturally declines with age, a condition called sarcopenia, which raises the risk of falls and frailty. Losing weight quickly can speed up muscle loss, especially if protein is low. An international expert group, the PROT-AGE study group, recommends that older adults eat 1.0 to 1.2 g of protein per kilogram of body weight a day, more than younger adults. Strength exercises are equally important. Our guide to protein on keto explains how to get enough.
Kidney health
Kidney function tends to decline with age. Long-term keto diets are linked with a higher risk of kidney stones, and people with kidney disease should not follow keto without specialist advice. Our guide to keto and kidney stones explains the risks.
Bone health
Older adults, especially women after the menopause, are at risk of osteoporosis. The NHS recommends getting enough calcium and vitamin D and doing weight-bearing exercise to help prevent it. Keto diets low in dairy, fruit and vegetables can make it harder to meet these needs.
Constipation and dehydration
Fiber intake often falls on keto, and older adults are already more prone to constipation. Thirst also declines with age, so dehydration is more likely, especially in the first weeks of keto, when the body loses more water. Our guides to fiber on keto and dehydration in older adults explain what helps.
Cholesterol
Some people see a large rise in LDL cholesterol on keto, which matters more when heart disease risk is already higher with age. Our guide to keto and cholesterol explains what to watch.
Undereating
Some older adults have a small appetite. Restrictive diets can lead to eating too little overall, causing unwanted weight loss and nutrient shortfalls.
If you want to try keto after 60
- Talk to your doctor first, especially about your medicines, kidney function and cholesterol. Ask for blood tests before you start and after a few months. Our guide to keto blood tests explains which ones.
- Prioritize protein at every meal: eggs, fish, poultry, Greek yogurt, cheese, tofu.
- Eat plenty of non-starchy vegetables for fiber, potassium and vitamins.
- Choose healthy fats: olive oil, nuts, seeds, avocado and oily fish, rather than mostly butter, cream and processed meat. Our Mediterranean keto guide follows this approach.
- Drink regularly, even if you’re not thirsty, and add a little salt in the first weeks if your doctor agrees.
- Do strength exercises at least twice a week to protect muscle.
- Consider a less strict approach if keto feels hard or causes side effects.
A gentler alternative
A moderate lower-carb diet that keeps some whole grains, beans and fruit, or a Mediterranean-style diet, can improve weight, blood sugar and heart health with fewer side effects, and is easier to maintain long term. Our guide to healthy eating for older adults explains what to focus on.
A sample lower-carb day for an older adult
- Breakfast: two eggs scrambled with spinach and mushrooms in olive oil, with a small pot of plain Greek yogurt and a few berries.
- Lunch: a large salad with salmon or chicken, avocado, olives, cucumber and a handful of seeds, dressed with olive oil and lemon.
- Snack: a small handful of almonds or a piece of cheese, with a glass of water.
- Dinner: roast chicken thighs or tofu with roasted cauliflower, broccoli and green beans, plus a few spoonfuls of lentils or hummus if you’re following a moderate lower-carb plan.
- Drinks through the day: water, tea, coffee or milk, sipped regularly rather than waiting until you feel thirsty.
This pattern gives protein at every meal, plenty of vegetables and healthy fats, and some calcium from the yogurt and cheese.
Signs to stop and call your doctor
Get medical advice if you notice dizziness when you stand up, falls or near falls, a racing or irregular heartbeat, confusion, tiredness that doesn’t improve after the first couple of weeks, severe constipation, dark urine or passing very little urine, or weight loss beyond what you planned. If you take diabetes medicines, know the signs of low blood sugar, such as shakiness, sweating and confusion, and how to treat it. Feeling sick, vomiting, stomach pain or fast breathing need urgent help, as they can be signs of ketoacidosis, which the NHS describes in its guide.
Common questions
Is keto safe for seniors?
It can be for some healthy older adults under medical supervision, but the risks of muscle loss, dehydration, medicine interactions and kidney problems are higher. A personalized plan from your doctor or a dietitian is the safest route.
Can keto help with memory or dementia?
There’s interest in ketones and brain health, but there isn’t good evidence that keto prevents or treats dementia. Our guide to brain foods covers what’s known.
How much protein do older adults need on keto?
Many experts suggest 1.0 to 1.2 g per kilogram of body weight a day for healthy older adults, spread across meals. People with kidney disease may need less; ask your doctor.
Do older adults need supplements on keto?
Some may. The NHS advises everyone to consider a daily 10 microgram vitamin D supplement in autumn and winter, and people who rarely go outdoors to take one all year. Depending on your diet and medicines, you may also need extra calcium, magnesium or vitamin B12. Ask your doctor or pharmacist before starting supplements, as some interact with medicines.
Safety note: Keto isn’t suitable for everyone. If you have diabetes, kidney or liver disease, take regular medication, or are pregnant or breastfeeding, talk to your doctor before cutting carbs this far (why it matters).
This article is general information, not medical advice. Talk to your doctor or a registered dietitian before making big changes to how you eat, especially if you have a health condition, take regular medication, or are pregnant or breastfeeding.
