I was looking into the trend on TikTok at the moment were people are just eating meat and animal products, saying they are losing weight and feeling great. This is crazy, in the short term it might be fine but long term without taking extra vitamins they are on a slippery slope to chronic illness.  
The carnivore diet is also low in fibre. Fibre is important for maintaining healthy digestion and preventing constipation.
Fibre is only found in plant-based foods and lack of fibre in the diet can lead to digestive issues and an increased risk of colon cancer.

Another concern is that the carnivore diet is low in antioxidants and phytochemicals, which are compounds found in plant-based foods that have been shown to have anti-inflammatory and anti-cancer properties. These compounds help to protect against chronic diseases such as cancer and heart disease.

I refer back to the Blue Zone study which shows that reducing your meat intake NOT increasing it can and does increase your life expectancy and reduce your risk of chronic illness.

Side effect of a meat only diet:
Side effects are similar to those reported for the ketogenic diet – bad breath, constipation, diarrhoea, headaches, dehydration.

In a 2012 study researcher found that of more than 100,000 men and women, People in the study who ate the most red meat tended to die younger and die more often from cardiovascular disease and cancer.

In the short term the meat only diet will help you lose weight only because you are cutting out the refined sugars which you should do on a balanced diet anyways. 

Personal reference. I have lost in total at the time of writing about 4.5 stone or  63 lbs on a balanced diet and I have better gut  health and less chance of a premature death. 

Why risk it? 

Below I’ve listed the vitamins and mineral to compare meat, an egg and some plant food. 

A balance diet is the way to go.