Keto Diet for Women Over 40

As you enter your 40s, taking care of your health becomes increasingly important, and for many women, managing their weight becomes a top priority and one of the hardest. The transition to menopause changes your body in ways that make weight loss genuinely more difficult, not just in your head.

In this post, we’ll explore how the keto diet can help, and what women over 40 should consider.

What Is the Keto Diet?

The ketogenic diet (or keto) is a high-fat diet with moderate protein and low carbohydrates. It differs from other low-carbohydrate diets because of its high-fat content.

A typical keto diet breakdown is as follows, showing percentages of total calorie intake. 

• Fats 70-80%
• Proteins 10-20%
• Carbohydrates 5-10%

What does this mean?

Think about it like this: if you choose to eat only bacon as your form of fat, you could eat 57 thin slices of bacon a day. You could also eat some protein and a tiny amount of carbs (about one fruit and a medium sweet potato).

Compared to a regular diet, the distribution of macronutrients is significantly in favor of fat. But carbohydrates are typically very low, usually only 20 to 50 grams a day.

What Foods Can You Eat in the Keto Diet?

Meat	Beef, chicken, turkey, veal, pork, buffalo meat, etc
Cured meats	Bacon, sausage, ham, etc
Fish and seafood	Salmon, tuna, trout, mackerel, shrimp, scallops, octopus, calamari, etc
Eggs	Eggs, egg products, and foods made with eggs
Cheese	Unprocessed cheese like cheddar, cream, blue, and mozzarella
Fat	Butter, cream, ghee
Oils	Coconut oil, olive oil, grape-seed oil, and avocado oil
Avocados	All types
Nuts	Almonds, Brazil nuts, walnuts, flax seeds, pumpkin seeds, and others
Seeds	Chia, sesame, and others
Vegetables	All low-carb veggies: green leafy vegetables, tomatoes, onions, peppers, etc
Condiments	Salt, pepper, herbs, and spices

What Foods Do You Need to Limit?

The most important part of this eating plan is meeting your macronutrient goals. To reach ketosis, you will need to limit sugar and carbohydrates.

Sugary Foods	Cookies, ice cream, cake, candy, jam, jelly, and other preserves with added sugar, canned fruit packed in sugar, pastries, donuts, milkshakes, and ready-to-eat cereals
Sugary beverages	Soda, energy drinks, fruit juice, etc
Grains	Bread, rice, pasta, cereal, and all types of grains, including whole grains
Fruits	All, except small portions of berries
Beans and Legumes	Black beans, kidney beans, lentils, peas, chickpeas, and all beans and legumes.
Root vegetables	Potatoes, malanga, sweet potatoes, carrots, and others
Condiments with added sugar	Barbecue sauce, ketchup, honey mustard, teriyaki sauce, etc
Alcohol	Beer, wine, mixed drinks

Sample Meal Plan

Breakfast

• Avocado and eggs
• Bacon and cheese egg omelet

Lunch

• Low-carb tuna cakes
• Salad with grilled chicken

Snack

• Turkey and cheese
• Berries and almonds

Dinner

• Beef & Broccoli Stir-fry
• Chicken enchilada casserole

What Keto Actually Does

• Keto can decrease hunger and appetite.
• It helps with weight loss.
• It may improve blood glucose levels.

Keto Decreases Appetite and Enhances Satiety

As women enter their 40s, many factors contribute to weight gain, including changes that increase hunger and appetite.

Ketosis, the goal of this diet, reduces hunger and increases fullness. So, naturally, women following the keto diet find it easier to eat less. In addition, dieters on this plan may feel less hungry because the small amount of carbohydrates consumed can reduce the appetite-stimulating hormones insulin and ghrelin.

Weight Loss

What the Research Says About Your Health

Heart Health

The evidence on keto and heart health is genuinely mixed.

Concerns can arise with the keto diet because of its high fat content, which is not generally recommended for heart health. The keto diet is also low in fiber, one of the most important components of good cardiovascular health.

On the other side, a 2024 cardiology journal review found that ketone bodies may help protect the heart in people with existing cardiovascular disease, and low-carbohydrate diets have shown real improvements in triglycerides, though that improvement tends to fade over time. One review found the difference wasn’t significant by 24 months, in part because people follow the diet less closely the longer it goes on.

Cholesterol tells a more complicated story, and it depends on who is doing keto. In a 2023 meta-analysis, LDL cholesterol rose significantly in normal-weight adults following a keto diet. In people with type 2 diabetes, though, a 2023 review found the opposite: keto raised HDL and lowered triglycerides more than other diets did.

The honest takeaway: your own response to keto can depend a lot on your starting health picture, which is part of why doing this under the guidance of a doctor or dietitian matters, not just diving in on your own.

Blood Glucose

During menopause, there are changes in hormone levels that can affect the way your body uses insulin. This can lead your body to produce more insulin, which may promote fat storage.

The ketogenic diet may help improve glucose levels within a normal range because it lowers carbohydrate intake.

Early research has found that keto diets can help lower HbA1c, a marker that reflects your average blood sugar over the past two to three months, in as little as three months.

That improvement is real, but it doesn’t necessarily hold over time. A review found keto didn’t outperform other diets for blood sugar control over two years, so the honest picture is less “keto is uniquely powerful for blood sugar” and more “keto can work, about as well as other sustainable approaches.

Warning!

Because of the minimal amount of carbohydrates in the keto diet, people taking medication that lowers blood sugar must consult their healthcare provider before starting on this eating plan.

These medications help the body process carbs. But if there is medication in the body but not enough carbohydrates, blood sugar can drop to a dangerous level, resulting in a medical emergency with potentially serious health consequences, including death.

What to Watch For

Digestive Health

Some people on keto experience GI issues, including diarrhea, constipation, vomiting, and abdominal pain. The impact of the keto diet on digestive health could be an issue for women transitioning to menopause, because the hormonal changes associated with this stage of life can cause stomach issues. This may also raise concerns for those already experiencing GI side effects on GLP-1.

Some earlier research raised concerns that high-fat diets could trigger gut inflammation and reduce beneficial bacteria. More recent evidence points the other way: a 2025 systematic review and meta-analysis of 14 studies found that very-low-calorie ketogenic diets significantly increased gut bacterial diversity in people with obesity, generally considered a marker of a healthier gut. Not every finding is positive, though; one 2024 animal study found that keto reduced some beneficial bacterial strains while increasing others linked to disease, so individual response can vary.

Nutrition Deficiencies

As we have seen, the keto diet is very restrictive, with minimal carbohydrates and large amounts of fat. Because of this restriction, it cuts back on foods that are high in fiber, vitamins, and minerals.

As a result, keto followers are at higher risk for nutritional deficiencies. For that reason, you may need fiber supplements to relieve constipation and multivitamins with minerals to prevent deficiencies.

Worth getting a nutrient panel if you have been following the diet for months. In most states, these are now available without needing a doctor’s order.

Keto also comes with its own long-term risks beyond deficiency. Cutting fruit and legumes removes compounds that normally help prevent kidney stones, and the diet’s effect on protein and acid balance can lower urine citrate, both of which raise your risk of developing one. Its long-term effects on the liver are still being studied, with some research showing improvement in fatty liver and other findings showing the opposite, so it’s worth having your liver enzymes checked if you’re on keto for an extended stretch.

Keto Diet and Social Life

If you’re following a keto diet, social gatherings might be more challenging. On the other hand, because this diet has become so popular, it might be easier to find keto-friendly foods.

Keto Flu

One of the ketogenic diet cons is what’s known as the keto flu, an unpleasant side effect that you might experience when you start due to the low intake of carbohydrates. This can include nausea, vomiting, headaches, fatigue, dizziness, insomnia, difficulty in exercise tolerance, and constipation.

Generally, these symptoms resolve in a few days or weeks and can be minimized by drinking plenty of fluids and consuming enough electrolytes.

Is the Keto Diet Safe for Women Over 40?

Before you commit to keto, weigh everything above against your own health history.

If you take medication that lowers your blood glucose, like insulin, follow this diet under the supervision of a registered dietitian and a physician. Your physician will likely need to adjust your medication to help prevent dangerously low blood sugar.

This eating plan isn’t recommended if you have any of the following chronic conditions:

• Liver disease
• Pancreatic disease
• Thyroid problems
• Eating disorders

My Personal Opinion as a Nutrition Expert

Overall, as a doctor in clinical nutrition, I believe in achieving a well-balanced diet long-term. However, I can see how the keto diet can help many reach their goals.

That said, it should be a short-term solution, with a plan to achieve better nutritional balance over time.

If you have more questions about the keto diet’s pros and cons and whether or not it is a good choice for you, check with your health care professional.

A registered dietitian can also create a healthy eating plan personalized to your needs. Just select a healthcare professional who aligns with your preferences and goals.