What Is a Well-Formulated Keto Diet Meal Plan?

Recommended keto foods: meat, fish, nuts, dairy, eggs

A ketogenic diet (keto) is a low-carb, high-fat diet that has been demonstrated to provide a variety of health benefits. A study published by the National Institutes of Health shows that keto is a powerful tool for losing weight. In many cases, benefits have been seen in the areas of diabetes, cancer, epilepsy, and Alzheimer’s disease.

So how do you get started on a keto diet? What are the foods you can eat and the ones you’ll want to avoid? This article explains a few of the benefits of a keto diet and then discusses how to move into action – what meals to plan and how.

The keto diet works by invoking a natural state in your body known as ketosis. Reducing carbs and replacing them with fat triggers this metabolic response in the body. When in this metabolic state, the body becomes highly efficient at burning fat and begins to do so immediately – both dietary fat and body fat.

Ketosis has additional health benefits as well. It turns fat into ketones in the liver, supplying additional energy for the brain. And it reduces blood sugar and insulin levels, which has even more benefits.

There are different types of keto diets including ones for bodybuilders and elite athletes like Olympians. We may discuss those in a future post, but for now, let’s take a look at a standard keto diet. The basic “entry-level” keto diet is very low carb, moderate protein, and high fat. The dietary intake is measured as: 70% fat, 20% protein, and 10% carbs. This standard version is the one most often used in cited research into keto diets and their effectiveness, so it is the ideal first step.

Since many who try keto are interested in fitness, there is a temptation to add more protein to the diet. This is a mistake that can undermine the chemical processes on which ketosis relies. Too much protein can be converted into glucose, which slows your body to shift into ketosis mode. So decide now to follow the plan if you want to get the best results.

The meal plans below avoid foods that are high in carbohydrates. The foods you’ll be eliminating will include:

Sugar (soft drinks, fruit juice, baked goods, ice cream, candy, etc.)
Grains and their products (wheat, rice, pasta, cereal, etc.)
Fruit (all fruits are high in carbs except small amounts of berries)
Beans (peas, pinto beans, lentils, chickpeas, etc.)
Root vegetables (potatoes, carrots, parsnips, sweet potatoes)
Processed foods (read all labels as low-fat foods have added sugar for flavor)
Alcohol (wine, beer, liquor)

And the foods that will make up the bulk of your diet will include:

Meat (steak, ham, sausage, bacon, chicken, turkey)
Fish (salmon, trout, tuna, mackerel)
Eggs (whole eggs)
Cheese and Butter (cheddar, goat, blue, as well as butter and heavy cream)
Nuts (almonds, walnuts, pecans, flaxseed, chia seed, etc.)
Healthy oils (olive oil, avocado oil, coconut oil)
Vegetables (all green vegetables plus tomatoes, onions, cauliflower, and peppers)

To help you get started, we have sketched out some basic meal plans any beginner can follow. Be sure to choose high-quality fresh foods when available and stick to the plan. Since ketosis is a metabolic state, any departure from the plan can undermine the process – no cheating!

Monday

BREAKFAST: veggie omelet with sliced tomatoes
LUNCH: green salad topped with keto chicken salad, and olives
DINNER: pan-seared salmon in butter with sautéed spinach

Tuesday

veggie-omelette-with-tomatoes-and-mushrooms | What Is a Well Formulated Keto Diet Meal Plan?

BREAKFAST: bell pepper stuffed with cheese, scrambled eggs and tomatoes
LUNCH: Thick slice of keto meatloaf (no bread crumbs!) topped with sautéed mushrooms
DINNER: pork chop with cream sauce and sautéed asparagus

Wednesday

BREAKFAST: three eggs fried in butter served on sautéed spinach with feta cheese
LUNCH: keto tuna salad served in tomato on a bed of greens
DINNER: oven-roasted chicken and sautéed broccoli

Thursday

BREAKFAST: full-fat yogurt and two hard-boiled eggs
LUNCH: kale salad topped with leftover roasted chicken
DINNER: grilled tuna steak with spinach salad and broiled tomatoes

Friday

BREAKFAST: avocado egg boats with tender greens
LUNCH: Caesar salad with chicken
DINNER: Ham steak and cheesy broccoli

Saturday

BREAKFAST: Spinach and eggs topped with feta cheese
LUNCH: Salmon burger topped with basil pesto, served on arugula with olive oil and lemon
DINNER: Coconut curry chicken with zucchini “noodles” and parmesan cheese

Sunday

BREAKFAST: Chia Coconut pudding topped with walnuts
LUNCH: cobb salad
DINNER: Meatballs with sautéed asparagus and a green salad

You’ve probably noticed: many of your favorites are included like bacon and cheese. But some cornerstones like bread have been replaced by a bed of greens. Make the commitment to complete 30 days on the plan before you decide if you like it – your tastes will adjust and the rate at which you begin losing fat will energize and encourage you to leave the bread alone for a few more weeks. You can do it!

Get a keto plan built on your bloodwork

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Now that you have an idea of what constitutes a well-formulated keto meal plan, bear in mind that it’s vital to monitor glucose and ketone levels as well.

A home meter tracks your blood glucose and ketone levels day to day. A fasting insulin test goes further and shows how your body handles carbohydrate over time.

Additionally, it’s best to consult professionals to get a tailored and personalized prescription low-carb or keto diet plan.

Why a keto plan stops working after the first few weeks

Fat loss slows on a well-formulated keto plan for reasons you can measure: insulin, thyroid output, cortisol, testosterone, and a lower resting metabolic rate.

Insulin. Insulin sensitivity falls for years before fasting glucose reads abnormal, because the pancreas releases more insulin to hold glucose in range.¹ A fasting insulin test catches it earlier, as does HOMA-IR, a score combining fasting insulin and glucose into one measure of insulin resistance.

Thyroid. Carbohydrate restriction lowers circulating T3, the active thyroid hormone. A 2025 review links that shift to changes in insulin signaling, inflammation, and deiodinase activity, the step that converts T4 into T3.² In most people it reads as an adaptation rather than thyroid failure. It matters more when thyroid function is already reduced, so review TSH (thyroid-stimulating hormone), free T3, free T4, and thyroid antibodies together.

Cortisol. Resting cortisol rises moderately during the first three weeks of a low-carbohydrate diet, then moves back toward baseline. That comes from a meta-analysis of 27 studies in 309 men.³ After training sessions of 20 minutes or longer, cortisol stayed higher for at least two hours.³ If you cut carbohydrate and added hard training in the same week, check morning cortisol.

Testosterone. Protein intake is the part of a keto plan that moves testosterone. In that meta-analysis, diets at 35% protein or more lowered resting total testosterone by roughly 5.23 nmol/L, while moderate-protein versions showed no consistent effect.³ The plan above sits at 20% protein, which falls in the moderate group. Low testosterone is still worth ruling out. Among men aged 45 and older in a primary-care study, 38.7% were below 300 ng/dL, and obesity carried 2.38 times the odds.⁴

Resting metabolic rate. Losing weight lowers resting metabolic rate beyond what your smaller body size predicts, and the difference can last years. Six years after “The Biggest Loser”, the 14 participants followed up remained about 704 kcal/day below baseline.⁵ That was a small group in an extreme deficit, so treat the size of the effect as an upper bound. The direction still holds.

Practical takeaway: before cutting calories again, get fasting insulin, a full thyroid panel, morning cortisol, and total and free testosterone from one draw. One abnormal marker is a data point. Three related markers form a pattern, and a pattern changes the plan.

The gap between a normal result and an optimal one

Standard lab ranges call your results normal even when your symptoms have not changed. Those ranges are built to flag disease. That leaves a wide band between a result that clears the reference range and a result that supports how you want to feel.

A fasting insulin near the top of the reference range is the clearest example. It passes on a standard panel even though insulin sensitivity has usually been falling for years by that point.¹

Physician-led care works in that band. A meal plan gives you fixed instructions. A physician reads your symptoms, your training, and your labs, then builds a protocol from them. Retesting shows when to adjust it.

Stop guessing at the reason it stalled

Opt Health reads your results against your life, builds the plan from them, and adjusts it at every retest.

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References

Tabák AG, Jokela M, Akbaraly TN, Brunner EJ, Kivimäki M, Witte DR. Trajectories of glycaemia, insulin sensitivity, and insulin secretion before diagnosis of type 2 diabetes: an analysis from the Whitehall II study. Lancet. 2009;373(9682):2215-2221. doi:10.1016/S0140-6736(09)60619-X
Vranjić P, Vuković M, Blažetić S, Viljetić B. Ketogenic diet and thyroid function: a delicate metabolic balancing act. Curr Issues Mol Biol. 2025;47(9):696. doi:10.3390/cimb47090696
Whittaker J, Harris M. Low-carbohydrate diets and men’s cortisol and testosterone: systematic review and meta-analysis. Nutr Health. 2022;28(4):543-554. doi:10.1177/02601060221083079
Mulligan T, Frick MF, Zuraw QC, Stemhagen A, McWhirter C. Prevalence of hypogonadism in males aged at least 45 years: the HIM study. Int J Clin Pract. 2006;60(7):762-769. doi:10.1111/j.1742-1241.2006.00992.x
Fothergill E, Guo J, Howard L, et al. Persistent metabolic adaptation 6 years after “The Biggest Loser” competition. Obesity (Silver Spring). 2016;24(8):1612-1619. doi:10.1002/oby.21538
Wilding JPH, Batterham RL, Calanna S, et al. Once-weekly semaglutide in adults with overweight or obesity. N Engl J Med. 2021;384(11):989-1002. doi:10.1056/NEJMoa2032183

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To set the calorie and macro targets this plan runs on, use our TDEE and macro calculator.