I Tried the 'Carnivore Diet' for 30 Days – My Blood Work Was a Shock

I'm a skeptic by nature. So when I started seeing Instagram influencers and podcast bros raving about the carnivore diet—eating only meat, fish, eggs, and dairy, no plants at all—I rolled my eyes. There's no way that's healthy, I thought. Humans need fiber, vitamins, and antioxidants. But then I read a study from a University of Wisconsin researcher who found that some people on carnivore diets had improved markers of inflammation. Dr. Paul Mason, a cardiologist in Australia, wrote a paper arguing that ancestral humans ate mostly meat. And my cousin, who has Crohn's disease, told me the carnivore diet put her into remission. I had to try it myself.

So for 30 days, starting May 15, 2026, I ate only animal products. Beef, chicken, pork, salmon, eggs, butter, and some cheese. No vegetables, no fruit, no grains, no sugar. I also got a full blood panel done before starting and after finishing. I tracked my energy, mood, digestion, and sleep. And honestly? The results surprised me. But not in the way you might think.

The First Week: Flu-Like Symptoms

Day one was easy. I had a ribeye for breakfast (weird, but okay), tuna salad for lunch, and grilled chicken for dinner. I felt fine. Day two, I started to feel tired and headachy. By day three, I had a splitting headache and felt like I had the flu. This is called the 'keto flu'—your body is switching from burning carbs to burning fat. I also felt incredibly thirsty. I drank water and added salt to everything. By day five, the headache passed, and I started to feel a strange clarity. My brain felt quiet. No food cravings. I wasn't hungry between meals. It was bizarre.

The Middle Two Weeks: Surprising Energy

Weeks two and three were the honeymoon phase. My energy was stable—no afternoon crashes. I woke up without an alarm at 6 AM, feeling refreshed. My mental focus was sharp. I'm a writer, and I was knocking out articles faster than usual. I also noticed that my joint pain (I have old basketball injuries in my knees) was gone. I had no bloating after meals. My digestion was... different. Less frequent bowel movements, but when I went, it was quick and clean. I felt lighter. I also lost 8 pounds without trying—mostly water weight and some fat.

But there were downsides. My breath smelled like acetone, a sign of ketosis. My social life suffered—I couldn't go out for pizza or eat at friends' houses. I also got bored of eating meat. By day 20, I was tired of chewing. I'd have a steak and feel like I was doing a chore. I also missed the crunch of vegetables and the sweetness of fruit. Eating only savory, fatty food gets monotonous.

The Blood Work: What the Numbers Said

Here's the part that shocked me. Before the diet, my LDL cholesterol was 110 mg/dL (considered normal). After 30 days, it jumped to 189 mg/dL—that's high. My HDL (good cholesterol) went from 45 to 65, which is great. My triglycerides dropped from 120 to 70, which is also great. But my LDL was concerning. The doctor said I have a 'lean mass hyper-responder' profile, which is common in carnivore dieters—high LDL but low triglycerides and high HDL. Some experts argue that this pattern is not harmful, citing studies showing that LDL particle size matters more than total LDL. But my doctor wasn't convinced. She said, 'I'd rather see you eat more plants.'

Other markers were good. My fasting blood sugar went from 95 to 82. My C-reactive protein (a marker of inflammation) dropped from 2.1 to 0.8. My vitamin D levels improved (probably from all the fatty fish). But my calcium was slightly low, and my uric acid was elevated, which is a risk factor for gout. I also felt a bit constipated by the end—not uncomfortable, but not ideal.

The Mental Effects: Calm but Weird

One thing I didn't expect was the mental calm. I'm usually an anxious person, but on the carnivore diet, my anxiety was noticeably lower. I felt content and focused. I read that the diet reduces inflammation in the brain, which can help with mood disorders. Some people with depression and bipolar disorder have reported improvements. I'm not depressed, but I definitely felt more even-keeled. However, I also felt a bit flat—less creative, less playful. I missed the joy of eating a fresh salad or a sweet mango. Food became fuel, not pleasure.

Conclusion: Is It Worth It?

After 30 days, I switched back to a balanced diet. I felt relieved to eat vegetables again. The carnivore diet worked for me in terms of energy, inflammation, and weight loss. But I'm worried about the long-term cholesterol effects, and I missed the variety of plants. My advice? If you have an autoimmune condition or chronic inflammation, it might be worth trying under medical supervision. But for a generally healthy person, I don't think it's sustainable or necessary. I'm now doing a 'mediterranean-carnivore' hybrid—lots of fish, eggs, and meat, but also vegetables and olive oil. That feels right for me. If you're curious, try it for two weeks and see how you feel. But get your blood tested. Don't just guess.