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 2024 meta-analysis of 29 trials in Nutrition and Metabolism found very-low-carbohydrate ketogenic diets improved fasting glucose, HbA1c, insulin, triglycerides and blood pressure in people with Type 2 diabetes. Worth noting what the same analysis did not find: no significant difference between groups in LDL or total cholesterol.
These aren't small things. For someone watching their A1C creep upward despite medication, or fighting blood pressure that keeps climbing, those numbers represent real relief.
And then there's the brain. This is the part that surprised me most when I started reading. I want to be careful here, because this is where hope outruns the evidence fastest. A small 2019 pilot at Wake Forest — seventeen people, eleven of them with mild cognitive impairment — found a modified Mediterranean-ketogenic diet shifted the gut microbiome in ways that tracked with Alzheimer's markers. That is the human end of it, and it is thin. Everything more dramatic is in animals: work at the University of Missouri found a ketogenic diet improved brain-energy metabolites in mice engineered to carry the human APOE4 gene, and a 2024 study in Cell Reports Medicine found a diet started late in life improved memory in aging mice by modifying synaptic proteins. Mice are not people. The human trials that do exist are small and short — a few dozen people over a few months — and some have nudged memory scores. None has run long enough to show that a ketogenic diet prevents dementia.
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. Harvard Health's March 2024 review lists "numerous risks" for the ketogenic diet, leading with its saturated fat load and the rise in LDL cholesterol, and advises talking to both a doctor and a registered dietitian before attempting it. A UK Biobank analysis presented at the American College of Cardiology's 2023 session, and published in JACC: Advances the following year, found people eating a low-carb high-fat pattern had higher LDL and roughly double the rate of cardiovascular events over about twelve years. Read the fine print: it was observational, and "keto-like" was defined loosely — under 100 grams of carbohydrate a day or under 25 percent of calories from carbohydrate, and more than 45 percent of calories from fat. That is looser than true ketosis. It is also not far from the liberal low-carb approach I describe below, which is a reason to take the signal seriously rather than wave it off. Diet was captured by a 24-hour questionnaire, though the researchers found the same association across the full cohort of more than ten thousand people and among those who completed two or more surveys.
There was a counterpoint, and it does not stand up. A 2025 JACC: Advances study followed 100 long-term ketogenic dieters with elevated LDL and reported no association between LDL levels and plaque progression — but the journal issued an expression of concern and then retracted the paper in May 2026. Its earlier companion analysis has not been retracted, though it was cross-sectional, covered 80 people, and studied lean, metabolically healthy adults, which is not most of us. It found no plaque difference despite a large gap in LDL. 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 2021 review in Frontiers in Nutrition 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 examined social isolation and food insecurity as interconnected determinants of older adults' health, and found them associated with depression, diabetes, cognitive decline and reduced quality of life — while cautioning that the six underlying studies were observational and of limited rigor.
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.
