It is one of the most extreme dietary shifts you can make, and it is having a moment.

The carnivore diet – which eliminates every plant-based food and focuses exclusively on meat, fish, eggs and some dairy – has moved from internet curiosity to genuine mainstream conversation, driven partly by high-profile advocates and partly by the kind of dramatic before-and-after stories that spread quickly on social media.

The idea is simple even if the practice is not. You eat animal foods only. No vegetables, no fruit, no grains, no legumes, no nuts, no seeds. Nothing that grew from the ground. The diet is characterised by the exclusive consumption of minimally processed animal-source foods including meat, organ meats, fish, seafood, eggs, animal fats and varying amounts of full-fat dairy products, with plant-based foods entirely eliminated.

For many Australians over 60 who have tried seemingly everything and are looking for something that actually shifts the needle, it is an appealing proposition. But is it a good idea? Here is what the evidence says.

What happens to your body in the first week

The first week of the carnivore diet is, by most accounts, the hardest. As the body depletes its carbohydrate stores and begins switching to fat and protein as its primary fuel source, many people experience what is sometimes called the adaptation phase – fatigue, headaches, brain fog and irritability. This is temporary, and most people find it passes by the end of the first week.

On the scales, the first week tends to produce the most dramatic results – but it is important to understand what you are actually losing. A significant proportion of early weight loss is water weight. When carbohydrates are removed from the diet, the body releases the glycogen stored in muscles and liver, and each gram of glycogen carries approximately three grams of water with it. That water leaves quickly.

For a person weighing 100 kilograms, a realistic expectation for the first seven days is a loss of two to four kilograms – most of which will be fluid rather than fat. This is not a reason to be discouraged. It is simply how the body works, and the fluid loss is real even if it is not the same as fat loss.

What to expect after one month

Carnivore diet before-and-after results typically show five to 10 kilograms of weight loss in the first 30 days, with improved energy by week three and significant body composition changes by month three.

For a 100-kilogram person, a realistic expectation is four to seven kilograms lost in the first month — with perhaps two to three kilograms of that being actual fat loss and the remainder being the fluid reduction that comes with eliminating carbohydrates.

The largest survey of carnivore dieters – 2,029 adults – found a median BMI reduction from 27.2 to 24.3, with 95 per cent reporting improved overall health. These are self-reported results from motivated adherents, so they need to be interpreted with appropriate caution. But they are consistent enough to suggest something real is happening for many people.

What the science actually says

A 2026 scoping review published in the journal Nutrients, which examined nine human studies, found that individual publications reported positive effects of the carnivore diet including weight reduction, increased satiety and potential improvements in inflammatory and metabolic markers.

At the same time, the review identified meaningful risks. Potential risks of nutrient deficiencies, particularly in vitamins C and D, calcium, magnesium, iodine and dietary fibre, as well as elevated LDL and total cholesterol levels, were identified.

The honest summary of the current evidence is that the carnivore diet appears to produce real weight loss and may improve certain metabolic markers for some people, but the long-term research is limited and the risks – particularly around nutrient deficiency and cholesterol – are genuine considerations that deserve serious attention.

Is the carnivore diet suitable for people in their 60s?

This is where the picture becomes more nuanced, and where the conversation with your GP becomes non-negotiable before you start.

There are reasons the carnivore diet might appeal to older Australians. The high protein intake supports muscle mass preservation, which becomes increasingly important after 60 as the body naturally loses muscle. Many people report reduced joint inflammation, improved sleep and better mental clarity. The simplicity of the eating pattern – no calorie counting, no portion control, just a clear list of what you can and cannot eat – suits many people who have found more complex diets hard to sustain.

But there are also reasons for particular caution in this age group. The elevated LDL cholesterol that some carnivore dieters experience is a genuine concern for anyone with existing heart disease or cardiovascular risk factors – a category that includes a significant proportion of Australians over 60. The absence of fibre has implications for gut health and bowel regularity. The lack of vitamin C from fruit and vegetables is a real nutritional gap that needs to be monitored. And the complete elimination of plant foods removes the antioxidants, polyphenols and phytonutrients that research increasingly links to healthy ageing and reduced dementia risk.

For someone in their 60s who is otherwise healthy, has no significant cardiovascular risk factors and approaches the diet thoughtfully – including monitoring blood markers, staying well hydrated and ideally including some organ meats for nutritional density – a short-term trial may be worth exploring with medical guidance.

For someone managing high cholesterol, heart disease, kidney disease or diabetes, the carnivore diet warrants very careful medical supervision before starting.

Seven-day carnivore diet meal plan

Here is a practical seven-day eating plan that covers the basics without overcomplicating things. The focus is on quality protein and fat, adequate salt and electrolytes (important during the adaptation phase) and variety within the allowed foods.

Day 1 Breakfast: Three scrambled eggs cooked in butter with bacon Lunch: Beef mince patties with salt and pepper Dinner: Ribeye steak with butter

Day 2 Breakfast: Smoked salmon with two fried eggs Lunch: Chicken thighs, skin on, pan-fried in tallow or butter Dinner: Lamb chops with bone marrow butter

Day 3 Breakfast: Three eggs omelette with hard cheese Lunch: Beef liver pan-fried in butter with bacon (liver once or twice a week is strongly recommended for nutritional density) Dinner: Slow-cooked beef brisket

Day 4 Breakfast: Bacon and eggs, any style Lunch: Tinned sardines or mackerel Dinner: Pork belly, roasted until crisp

Day 5 Breakfast: Leftover pork belly with fried eggs Lunch: Beef mince patties with hard cheddar melted on top Dinner: Whole roasted chicken, skin on, with butter under the skin

Day 6 Breakfast: Smoked salmon with scrambled eggs and butter Lunch: Leftover roast chicken Dinner: T-bone steak with butter and salt

Day 7 Breakfast: Three fried eggs with crispy bacon Lunch: Beef short ribs, slow cooked Dinner: Pan-fried salmon with butter and lemon (lemon is technically a plant food – some strict carnivore adherents avoid it, others allow a squeeze)

What to drink: Water, sparkling water and black coffee or tea are generally accepted. Stay well hydrated, particularly in the first week. Adding a small amount of salt to water can help replace electrolytes lost with the fluid reduction.

What you need to know

The carnivore diet is not a fad in the sense that the results many people experience are real. For weight loss in the short term, particularly for people who struggle with more moderate dietary approaches, it can be genuinely effective. The high protein intake has real benefits for muscle preservation in older adults.

But it is also a significant departure from everything mainstream nutrition has recommended for decades, the long-term research is genuinely limited, and the risks around cholesterol, nutrient deficiency and gut health are not trivial — particularly for Australians in their 60s who are managing other health conditions.

If you are considering it, have a full blood panel done before you start, repeat it after 30 and 90 days, and make sure your GP knows what you are doing. It is not a diet to begin without that conversation.