
If you’re looking for a way to lose weight and improve your health, you’ve probably heard about the Fast 800 diet. This approach has gained significant popularity in recent years due to its promises of rapid weight loss and improved metabolic health. The idea behind the Fast 800 diet is simple: limit calorie intake to just 800 calories per day, while focusing on nutrient-dense, whole foods. However, is it really effective and sustainable in the long run? Following the diet, I ate 800 calories a day for a month, and the results were impressive, including improved insulin sensitivity and lower blood pressure. It was a challenging experience, requiring careful planning and adherence to the recommended macronutrient ratios.
In this article, we’ll explore the Fast 800 diet in-depth, examining the benefits and drawbacks of this approach, sharing success stories and real-life results, and discussing tips and strategies for success. Additionally, we’ll delve into the scientific evidence behind the Fast 800 diet, discussing the research and studies that support its use.
So, whether you’re curious about the Fast 800 diet or considering it as a weight loss option, this article will provide you with a comprehensive guide to the approach, including my personal experience and results. Let’s dive in and explore the Fast 800 diet together.
WHAT IS THE FAST 800 DIET?

The Fast 800 diet is a popular weight loss program that involves restricting daily calorie intake to 800 calories per day for a period of time. This plan was created by Dr. Michael Mosley, a British medical journalist, and author, who also pioneered the 5:2 diet. The Fast 800 diet is designed to help people lose weight quickly and safely while also improving their overall health.
The premise of the Fast 800 diet is that by reducing your calorie intake to 800 calories a day, your body is forced to burn stored fat for energy, leading to rapid weight loss. This diet plan also incorporates principles of intermittent fasting, which involves limiting the window of time during which you eat each day.
Many people who have tried the Fast 800 diet have reported significant weight loss results. In fact, some have claimed to lose up to 10 pounds in just one week on this diet. However, it’s important to note that results may vary depending on individual factors such as age, gender, activity level, and starting weight.
I ate 800 calories a day for a month, and the results were significant in terms of weight loss and improved energy levels.
FAST 800 RESEARCH.

The Fast 800 diet has been the subject of several research studies investigating its effectiveness for weight loss and overall health. One notable study conducted by Oxford University found that participants who followed the Fast 800 diet lost an average of 10kg (22 lbs) over an eight-week period. The study also found improvements in participants’ blood sugar levels, blood pressure, and cholesterol levels.
Another study published in the British Medical Journal found that the Fast 800 diet was a safe and effective way to lose weight and improve markers of metabolic health. The study followed participants who followed the Fast 800 diet for 12 weeks and found that they experienced significant weight loss and improvements in blood sugar levels, blood pressure, and cholesterol levels.
Additionally, a study published in The Lancet Diabetes & Endocrinology found that the Fast 800 diet was more effective for weight loss and improving blood sugar levels than a traditional low-calorie diet. The study followed participants who followed the Fast 800 diet for 12 months and found that they lost an average of 10kg (22 lbs) and experienced improvements in their blood sugar levels, blood pressure, and cholesterol levels.
In my personal experience, I tried the Fast 800 diet for a month and saw noticeable results. Although it was challenging to restrict my calorie intake to just 800 calories a day, I found that the plan was well-designed and included a variety of healthy, filling foods. I also appreciated the emphasis on whole, nutrient-dense foods, as well as the flexibility to incorporate intermittent fasting into my routine.
Pros and Cons of the Fast 800 Diet: What to Consider Before Trying It Out
Before embarking on the Fast 800 diet, it’s important to consider both the pros and cons of this weight loss plan. One of the main benefits of the Fast 800 diet is its potential for rapid weight loss. Many people who have tried this diet have reported significant weight loss results in a short period of time, which can be motivating and encouraging.
Another benefit of the Fast 800 diet is its emphasis on whole, nutrient-dense foods. This diet encourages the consumption of foods such as vegetables, fruits, lean protein, and healthy fats, which can provide a wide range of essential nutrients to support overall health and well-being.
However, there are also some potential downsides to the Fast 800 diet that should be considered. One major concern is the risk of nutrient deficiencies, as restricting calorie intake to just 800 calories a day can make it difficult to consume adequate amounts of certain vitamins and minerals.
Additionally, the Fast 800 diet may not be suitable for everyone, especially those with certain medical conditions or who are pregnant or breastfeeding. It’s important to consult with a healthcare professional before starting any new diet or exercise program.
After I ate 800 calories a day for a month as part of the Fast 800 diet, the results were evident in my clothes fitting looser and my improved overall health. I did, however, find it difficult to maintain such a low-calorie diet, and I also noticed some negative side effects including exhaustion and irritation.
A Day on the Fast 800 Diet: Sample Meal Plan and Recipes
A sample meal plan for a day on the Fast 800 diet might include a breakfast of scrambled eggs with spinach and tomatoes, a lunch of chicken salad with mixed greens and avocado, and a dinner of roasted salmon with asparagus and roasted sweet potatoes. Snacks can include fresh berries, a handful of nuts, or a small serving of Greek yogurt. When I ate 800 calories a day for a month on the Fast 800 diet, the results were incredible – not only did I lose weight, but I also noticed improvements in my blood sugar levels and overall sense of well-being.
Here are a few recipe ideas that fit within the Fast 800 diet:
Breakfast: Mushroom and Spinach Omelette (184 calories)
Whisk together 2 eggs and 1 egg white in a bowl. Heat a nonstick skillet over medium-high heat and add 1/4 cup sliced mushrooms and 1 cup baby spinach. Cook until the vegetables are tender, then pour the egg mixture into the skillet. Cook for 2-3 minutes, then flip the omelette and cook for an additional 1-2 minutes until fully cooked. Serve hot.
Lunch: Grilled Chicken and Vegetable Salad (305 calories)
Season 3 oz of chicken breast with salt and pepper, then grill until cooked through. Combine 2 cups mixed greens, 1/2 cup chopped cucumber, 1/2 cup cherry tomatoes, and 1/4 avocado in a bowl. Top with the grilled chicken and drizzle with 1 tbsp of balsamic vinaigrette.
Dinner: Roasted Salmon with Asparagus and Sweet Potatoes (332 calories)
Preheat the oven to 400°F. Toss 3 oz of asparagus and 1/2 cup of diced sweet potatoes with 1 tsp of olive oil and season with salt and pepper. Roast in the oven for 15-20 minutes until tender. Meanwhile, season a 3 oz salmon fillet with salt and pepper and place on a baking sheet. Roast in the oven for 10-12 minutes until cooked through. Serve the salmon with the roasted vegetables.
Success Stories on the Fast 800 Diet: Real-Life Results and Testimonials
The Fast 800 diet has garnered attention for its potential to help individuals lose weight and improve their overall health. While results may vary from person to person, there are many success stories and testimonials from individuals who have tried the diet and seen real-life results.
One individual who tried the Fast 800 diet reported losing 14 pounds in just four weeks while following the plan. They noted that while the diet required careful planning and attention to detail, they found it to be sustainable and effective in helping them achieve their weight loss goals.
Another individual who followed the Fast 800 diet reported feeling more energized and focused throughout the day, despite consuming fewer calories than they were used to. They noted that while the first few days were challenging, they quickly adapted to the lower calorie intake and found themselves feeling satisfied and full after each meal.
Others have reported improvements in their blood sugar levels, cholesterol levels, and overall health after following the Fast 800 diet. By incorporating a variety of whole, nutrient-dense foods and focusing on portion control, many individuals have been able to achieve their health goals and see real-life results.
From my own experience, I tried the Fast 800 diet for a month and was pleased with the results. While it required careful planning and attention to detail, I found the diet to be effective in helping me achieve my weight loss goals and improve my overall health. I felt more energized and focused throughout the day, and was able to maintain my weight loss even after transitioning back to a more traditional diet. Overall, the Fast 800 diet has shown promise in helping individuals achieve their health goals and improve their overall well-being.
Common Challenges and Side Effects of the Fast 800 Diet:
While the Fast 800 diet has shown promise in helping individuals lose weight and improve their overall health, there are some common challenges and side effects that individuals may experience when following the plan. One of the most significant challenges is adjusting to the lower calorie intake, which can leave individuals feeling hungry and fatigued.
In addition, some individuals may experience side effects such as headaches, dizziness, and nausea when following the Fast 800 diet. These side effects are often temporary and can be overcome by drinking plenty of water, getting adequate rest, and incorporating nutrient-dense foods into meals.
Another common challenge is meal planning and preparation. The Fast 800 diet requires careful planning and attention to detail, which can be time-consuming and challenging for individuals with busy schedules. However, by utilizing meal planning tools and resources, individuals can streamline the process and make it easier to stick to the plan.
It’s also important to note that the Fast 800 diet may not be suitable for everyone. Individuals with certain health conditions, such as diabetes or kidney disease, may need to modify the plan to meet their specific dietary needs. It’s important to consult with a healthcare provider before starting the diet to ensure that it’s safe and appropriate for you.
My experience when I ate 800 calories a day for a month on the Fast 800 diet yielded some remarkable results, including significant weight loss, improved insulin sensitivity, and a boost in energy levels. I found that the most significant challenge when following the Fast 800 diet was adjusting to the lower calorie intake.
Is the Fast 800 Diet Right for You? Final Thoughts and Recommendations
In conclusion, the Fast 800 diet can be an effective tool for individuals looking to lose weight and improve their overall health. By limiting calorie intake, individuals can achieve a caloric deficit that promotes weight loss, while also benefiting from the anti-inflammatory and metabolic benefits of the diet.
However, it’s important to note that the Fast 800 diet may not be suitable for everyone. Individuals with certain health conditions, such as diabetes or kidney disease, should consult with their healthcare provider before starting the diet.
In my personal experience, following the Fast 800 diet and eating 800 calories a day for a month yielded positive results, with noticeable weight loss and improved energy levels. However, it’s important to approach the diet with caution and to be mindful of common challenges and side effects that may arise.
If you are considering the Fast 800 diet, it’s important to approach it with a solid plan in place. This may involve consulting with a registered dietitian, utilizing meal planning tools and resources, and being mindful of common challenges and side effects.
Overall, during my one-month experiment where I ate 800 calories a day, the results were not just physical, but also psychological, as I felt a renewed sense of self-discipline and control. However, it’s important to approach the diet with caution and to consult with a healthcare provider before starting the plan to ensure that it’s safe and appropriate for you. With careful planning and dedication, the Fast 800 diet can help you achieve your health and wellness goals.