The first rhubarb appeared in my neighbor's garden yesterday. Just a few stalks, barely a foot tall, pushing through soil that was still cold to the touch. I crouched down to look at them — those deep red stems with leaves still furled tight, not yet ready to open. There's something about April in the mountains, the way things insist on growing before conditions are perfect. I thought about that on my walk this morning, climbing through the fog along the French Broad, my breath visible, the trail still muddy from last night's rain.
I'd been thinking about food. Not in the pleasant way — not the way I think about Harold's hash browns at the Waffle House or my mother's sweet potato pie. I'd been thinking about a conversation at Seasons of Grace last Tuesday, when a woman I'll call Diane, seventy-two, a retired dental hygienist with a sharp mind and a sharper sense of humor, told the group she'd started a ketogenic diet three weeks earlier. She was excited. Her daughter had lost forty pounds on it. A friend at church swore it cleared her brain fog. Diane had bought a book, stocked her refrigerator with avocados and bacon, and thrown out her bread.
\"I feel like I'm finally doing something,\" she said.
Nobody in the room wanted to take that away from her. But a few of us exchanged glances. Because we'd been here before — with different diets, different promises. And the question that matters isn't whether keto works. It's whether keto is safe for you, given the medications and conditions most older adults are already managing. (We built a 12-question keto safety screen for exactly that — five minutes, no signup, flags the conditions that make keto a bad idea before you start.) It's whether it works for us. For bodies that have already crossed into their seventh decade. For bodies on medications, with aging kidneys, with bones that need every bit of calcium they can get. For lives built around Sunday dinners and potluck suppers and a granddaughter's birthday cake.
That's the conversation I want to have here. Not a verdict. A conversation.
What Keto Actually Asks of Your Body
The ketogenic diet, at its core, asks your body to change its fuel source. Normally, we run on glucose — the sugar our bodies make from carbohydrates. Bread, fruit, rice, potatoes. On a ketogenic diet, you cut carbohydrates down to roughly 20 to 50 grams a day. That's about the amount in a single banana and a slice of toast. Everything else comes from fat — about 70 to 75 percent of your daily calories — with moderate protein filling in the rest.
When your body can't find enough glucose, the liver starts converting fat into molecules called ketones. Your cells, including your brain cells, can burn ketones for energy. This metabolic shift is called ketosis, and it's the engine behind the diet's effects, both the helpful ones and the worrisome ones.
For a younger person, this transition takes a few days of discomfort — headaches, fatigue, what people online call the \"keto flu.\" For those of us past sixty-five, the adjustment can take longer and feel harder. Our metabolism is already slower. Our kidneys don't clear waste as efficiently. And we're often taking medications that depend on a relatively stable nutritional landscape.
Diane told me she felt terrible for the first ten days. \"I thought I was getting the actual flu,\" she said. She almost quit. She didn't, and by week three she felt better. But that rocky start is worth taking seriously, because for some seniors, it isn't just discomfort — it's a signal.
Why So Many of Us Are Drawn to It
I understand the appeal. I genuinely do.
After sixty-five, weight becomes harder to manage. The metabolism that forgave us our indiscretions at forty doesn't extend the same grace at seventy. Type 2 diabetes diagnoses climb. Doctors mention blood sugar at every visit. And then someone — a friend, a neighbor, a segment on morning television — says the word \"keto,\" and it sounds like a key that fits a lock we've been struggling with for years.
The research gives that hope some grounding. A 2025 review in Precision Nutrition analyzing five randomized controlled trials found that ketogenic diets produced notable reductions in hemoglobin A1C, fasting blood glucose, fasting insulin, and weight in people with Type 2 diabetes. A separate meta-analysis of 29 trials published in Nutrition and Metabolism showed significant improvements in triglycerides, blood pressure, and glycemic control. A study from the Mayo Clinic found that among patients sixty-five and older who adopted a ketogenic diet, the most common reasons were weight loss (59 percent) and diabetes management (34 percent).
These aren't small things. For someone watching their A1C creep upward despite medication, or carrying extra weight that makes their knees ache and their blood pressure climb, those numbers represent real relief.
And then there's the brain. This is the part that surprised me most when I started reading. Research from Wake Forest School of Medicine, published in 2025, found that a modified Mediterranean-ketogenic diet positively affected the gut microbiome in ways that may reduce Alzheimer's risk. A study from the University of Missouri found that ketogenic diets improved memory and brain energy levels in those carrying the APOE4 gene — one of the strongest genetic risk factors for Alzheimer's. A 2024 study in Cell Reports Medicine demonstrated that ketogenic diets administered later in life improved memory by modifying proteins involved in synaptic signaling.
For those of us who have watched a parent disappear into Alzheimer's — and I have, four years of watching my mother forget my name before she passed in 2003 — the idea that what we eat might protect our cognitive future is hard to set aside. I don't set it aside. I hold it carefully, the way you hold something fragile, knowing it's not the whole story.
What the Numbers Don't Say About Our Bodies
Here is where I need to be honest, because Eleanor Hayes does not sell hope without naming what it costs.
The American Heart Association rated the ketogenic diet in Tier 4 — its lowest category — for alignment with heart-healthy eating guidelines. Their concern: high saturated fat intake, inadequate fiber from restricting whole grains, fruits, and legumes, and the potential for elevated LDL cholesterol. A Harvard Health review in 2024 concluded the diet \"doesn't meet standards for a healthy diet and may not be safe for some people with heart disease.\" A study presented at the American College of Cardiology's 2023 Scientific Session found that people following keto-like diets had higher levels of LDL cholesterol and a twofold increased risk of cardiovascular events.
There's a counterpoint. A 2025 study published in JACC: Advances followed 100 long-term ketogenic dieters who developed elevated LDL and found no association between LDL levels and plaque progression, with critics noting the study had methodological concerns. The science is genuinely unsettled. But for seniors who already have cardiovascular risk factors — and most of us have at least one — the uncertainty itself is a reason for caution.
Then there are the bones. A systematic review in PMC found that long-term ketogenic diets are associated with decreased bone mineral density and increased fracture incidence, particularly in studies following the diet for extended periods. The mechanism makes sense: rapid weight loss reduces the mechanical load on bones, and restricting dairy, fruits, and vegetables can cut into calcium, vitamin D, and potassium intake. For anyone already at risk for osteoporosis, this deserves a real conversation with your doctor. Not a check-in. A conversation.
And the kidneys. Our kidneys lose roughly 10 percent of their function per decade after forty. A diet that increases protein and ketone production asks more of kidneys that are already doing less. For seniors with existing kidney disease, even mild, the ketogenic diet can push an organ that's running on reduced capacity. The research on this in healthy older adults is still thin — we simply don't have enough long-term studies to say it's safe.
What I've found, in years of sitting with people navigating health decisions, is that the body doesn't read headlines. It reads what you feed it, day after day, and it responds according to its own history — the medications it metabolizes, the bones it has built over seventy years, the kidneys that have been filtering since before you learned to walk.
The Medication Conversation Most People Skip
This is the section I wish someone would hand to every senior sitting in a doctor's waiting room with a keto book in their lap.
If you take warfarin (Coumadin), the ketogenic diet's emphasis on leafy greens like spinach, kale, and broccoli means significant fluctuations in vitamin K intake. Vitamin K directly affects how warfarin works. Inconsistent intake can make your blood too thin or not thin enough. Newer blood thinners like apixaban (Eliquis) don't interact with vitamin K the same way, but keto-related dehydration can still affect clotting.
If you take diabetes medications — insulin, sulfonylureas, or even metformin — a sudden drop in carbohydrate intake can cause dangerously low blood sugar. Hypoglycemia in a seventy-year-old living alone is not the same as hypoglycemia in a thirty-five-year-old with a partner in the next room. A study in Nutrition and Metabolism stressed that physicians must learn to safely de-prescribe insulin and oral diabetes drugs when patients begin very low-carb diets, because the combination of the diet's blood sugar lowering effect plus the medication's can drop levels to dangerous territory.
If you take blood pressure medication — ACE inhibitors, diuretics, beta-blockers — the keto diet's natural diuretic effect, especially in the first weeks, can compound the medication's blood pressure lowering, leading to dizziness, fainting, and falls. Falls in our age group break bones and change lives.
This isn't a reason not to consider keto. It's a reason to consider it with your doctor's hands on the wheel alongside yours.
Modified Approaches That May Fit Our Lives Better
What I've learned, both from the research and from watching people try, is that strict ketogenic diets and aging bodies are not always natural partners. But the principles underneath the diet — reducing processed carbohydrates, choosing better fats, stabilizing blood sugar — those principles are sound at any age.
The Mediterranean-ketogenic approach is the one with the most promising research for older adults. Wake Forest School of Medicine's modified Mediterranean-ketogenic diet uses extra-virgin olive oil as the primary fat, emphasizes fish and non-starchy vegetables, and allows moderate reintroduction of carbohydrates after an initial ketogenic phase. This is the approach linked to those Alzheimer's prevention findings. It's also more sustainable, more social, and more forgiving.
Liberal low-carb — keeping carbohydrates between 50 and 100 grams daily rather than the strict 20 to 50 — maintains many of the blood sugar benefits without the severity of full ketosis. You can eat a small portion of sweet potato. You can have berries with your yogurt. You can sit at your granddaughter's birthday table without calculating whether the frosting will knock you out of ketosis.
Cyclical approaches — eating stricter low-carb most days with planned higher-carb days once or twice a week — can support social eating, nutrient diversity, and the psychological relief of not being \"on\" a restrictive diet every single day.
What matters more than the specific approach is the quality of what you eat. Salmon, olive oil, walnuts, leafy greens, eggs, avocados — these foods serve the body well whether you're in ketosis or not. The supplements and nutritional choices we make each day build on this foundation.
Keto and GLP-1 Medications: A Question I Hear More and More
Since writing about GLP-1 drugs and muscle loss a few weeks ago, several people in my circle have asked whether they can follow a keto diet while taking Ozempic, Wegovy, or Mounjaro.
The short answer: it's possible, but it requires caution. Both the ketogenic diet and GLP-1 medications suppress appetite and can cause nausea and constipation. Together, these side effects can intensify. The greater concern for seniors is getting enough nutrition at all. When appetite drops from both the medication and the dietary restriction, it becomes genuinely difficult to eat enough protein, enough calories, enough of the micronutrients our bodies need.
Nutritionists writing in NPR's March 2026 coverage of GLP-1-friendly diets emphasized that the single most important factor is adequate protein intake, regardless of carbohydrate approach. If you're on a GLP-1 medication, your protein needs are already elevated — 1.2 to 1.6 grams per kilogram of body weight daily, significantly more than the standard recommendation. Adding keto's carb restrictions on top of already reduced appetite makes hitting that protein target harder, not easier.
If you're drawn to both approaches, talk to your doctor about sequencing — stabilize on the medication first, then consider gradual carbohydrate reduction, rather than launching both at once.
Practical Eating for Seniors Considering Lower-Carb Life
I want to be specific here, because vague dietary advice helps no one. And because I know many of us are cooking for one, on a fixed income, with hands that may not do well with elaborate preparation.
Breakfast: Two eggs scrambled in olive oil with a handful of spinach. A few slices of avocado. Coffee with cream if you like it. Protein: roughly 15 grams. Cost: under two dollars.
Lunch: A can of wild salmon (far cheaper than fresh) mixed with a spoonful of mayonnaise, served on a bed of lettuce with cherry tomatoes and a drizzle of olive oil. Protein: roughly 25 grams. Cost: about three dollars.
Dinner: A chicken thigh (bone-in, skin-on — the affordable cut) roasted with broccoli and a generous pour of olive oil. Protein: roughly 28 grams. Cost: under four dollars.
Snack: A handful of walnuts. A few celery sticks with almond butter. Full-fat Greek yogurt if you're doing the liberal low-carb approach.
That's roughly 80 grams of protein, which approaches the target for a 150-pound senior. It's not complicated. It doesn't require specialty ingredients or a subscription box. And it leaves room for a cup of berries or a small sweet potato if you're not doing strict keto.
Hydration matters more than usual on any low-carb approach. Ketosis acts as a natural diuretic — you'll urinate more, especially in the first weeks. Seniors already have a diminished thirst response. Some experts estimate that a seventy-year-old on keto could lose up to two liters of fluid daily without feeling thirsty. Drink water before you're thirsty. Add a pinch of salt to your water or sip bone broth for electrolytes. Watch for dizziness, dry mouth, and dark urine.
The Part Nobody Writes About: What Restrictive Eating Does to a Life
This is the section I keep coming back to. Not the macros, not the studies — the life.
Diane, the woman from my group, called me last week. Three months into keto. She's lost twelve pounds. Her fasting glucose has improved. Her doctor is cautiously pleased.
But she told me something else. Her church has a monthly potluck supper — has for twenty years. She went to the last one and ate nothing. Sat at the table with her friends, drank water, and watched them eat. \"I didn't want to make a fuss,\" she said. \"But I felt like I was on the outside of something.\"
I know that feeling. I've watched it settle over people in my wellness circles for years — the quiet withdrawal that happens when food becomes a calculation rather than a communion. For seniors, eating together is not a luxury. It's medicine. Shared meals reduce isolation, which research consistently links to depression, cognitive decline, and even mortality in older adults. A 2025 systematic review in Frontiers in Nutrition found that social isolation and food insecurity are interconnected health determinants that disproportionately affect older adults, and that eating alone is associated with lower dietary variety and reduced appetite.
A diet that improves your blood work but costs you the potluck supper is not an uncomplicated victory.
I told Diane what I believe: that she's allowed to bring a dish she can eat and share it with the table. That she's allowed to take a small serving of Mrs. Patterson's cornbread and call it a cyclical carb day. That the numbers on her glucose monitor matter, and so does the feeling of sitting at a table surrounded by people who have known her for decades, laughing with her mouth full.
We are more than our metabolic state.
Talking to Your Doctor: The Questions Worth Asking
If keto — or any version of lower-carb eating — interests you, bring better questions to your next appointment. Not \"Is keto good for me?\" but:
- What is my current kidney function, and can it handle increased protein and ketone production?
- Which of my medications might need adjustment if I reduce carbohydrates significantly?
- Can we get a baseline DEXA scan for bone density before I make major dietary changes?
- What's my protein target, given my age and current muscle mass?
- Is there a registered dietitian you'd recommend who has experience with older patients and low-carb approaches?
Write them down. On the back of a grocery receipt if you want — it worked for a friend of mine. Your doctor manages dozens of patients in fifteen-minute slots. The questions you bring shape the conversation you get.
Where the Trail Opens
I walked home this morning through clearing fog. The rhubarb will be ready in a few weeks — tart and demanding, the way spring always is in these mountains. It doesn't wait for permission. It pushes through cold soil because that's what living things do.
Our bodies are doing the same. Pushing through, adapting, asking us to pay attention. The ketogenic diet is one path through this landscape. Not the only one. Maybe not the right one for you. But if it is, walk it with your eyes open — with your doctor beside you, with your protein counted, with your medications accounted for, and with a seat saved at the potluck table.
We are still learning how to feed these beautiful, complicated bodies of ours. And the fact that we're asking the question — that we're reading and wondering and weighing the evidence — means we haven't stopped tending to ourselves. That's not a small thing.
It's the whole thing.
