Do You Understand the Science of Slim?

By Nicole German (RD, LD)

science-of-slimThe Smarter Science of Slim, by Jonathan Bailor, has received praise from dozens of doctors, personal trainers, and nutritionists.

So, I decided to take a look for myself. What I have found is a diet truth book—basically, a reader-friendly encyclopedia of a how to get and stay slim.

Jonathan Bailor is an entrepreneur, personal trainer, and Microsoft program manager. This does not discredit him. Bailor performed intensive research for over 10 years examining thousands of studies to deliver the truth about weight loss and nutrition in his book.

8 Truths Science Reveals About Being Slim

  1. Calories are not all that matter. It is about the types of foods you eat, and your hormones affect how your body processes those calories. S.A.N.E. (Satiety, Aggression, Nutrition, Efficiency) calories are key. These type of calories will fill us up quickly and keep us full for a while.
  2. The food pyramid is rubbish. Pure carbohydrates are not a good diet foundation. Load up on non-starchy vegetables and lean proteins so that you stay fuller. Water, fiber, and proteins are the key to staying full.
  3. A long-term weight loss approach and mindset is needed to achieve a long term healthy weight.
  4. High intensity cardiovascular and resistance training will increase weight loss. Low and slow exercise like walking and light biking will yield fewer results. This means you can exercise for a shorter period of time and to get a more efficient workout.
  5. The metabolism runs based on hormones and diet can improve our hormone levels, and therefore, improve our body weight.
  6. Focus on naturally balancing your meals with whole foods that our ancestors ate.
  7. Being healthy is bad for big business. We must lead our own life, and seek out the true way to reach optimal health. Governments and big business have a big stake in the food, supplement, and agricultural industry. The foods that they profit the most from, are the foods that are the worst for us!
  8. Added sweeteners are a huge problem in keeping the world unhealthy. Sugars are added to almost everything. This is why it is important to avoid most all processed foods of any kind.

Good and Bad Foods

good-foodsGood Choices

Non-starchy vegetables, lean proteins, seafood, fat free or low fat cottage cheese and plain Greek yogurt, fruit, eggs, nuts, seeds, water, and green tea.

bad-foodsBad Choices

Added sweeteners, processed carbohydrates/starches, “whole grain” starch, and some oils. Examples: low fat salad dressings, “weight loss” products like 100 calorie packs, most anything not refrigerated.

It’s Time To Eat Smarter

The main theme of this book is to eat smarter. This means eating higher quality foods (non-processed) so that our health and hormones improve, and we then begin to lose weight. As we lose weight, our bodies perform better like naturally thin people.

This is just a brief overview of what the book is like. The Smarter Science of Slim is hugely in-depth, and hard to cover in one small blog post. However, if this intrigues you, I would highly recommend picking up the book here on Amazon to learn the foundation of weight loss nutrition.

This book isn’t as much of a how to diet book. Rather, it focuses on…..

  • Explaining to you why so many are obese.
  • Why it is difficult to lose weight.
  • The science behind body fat.

Do you know the science behind fat loss?


  1. Dan

    I read another interview with him on the web. I agreed with him that the fat from nuts and fish is healthier than that from red meat. He also stated that he didn’t eat any grains of any kind because they are not nutrient dense. However, Wheat germ, rice bran and oat bran are all extremely nutrient dense and they all tend to lower cholesterol. Barley also lowers cholesterol. Joel Fuhrman did say that whole grains aren’t as nutrient dense, but he doesn’t forbid them on his diet.

  2. Dan

    I don’t really agree with him or Spectra about carbs. I eat a big bowl of oatmeal with flax everyday and I am very slim as well, maybe not as low a BMI as Spectra, but certainly well into the healthy range for my height. I also eat air popped popcorn virtually everyday and never gain weight. i\In fact I am starting to lose more weight. even though I consume well over 3000 calories a day. I am very active. Bailor completely forbids oats and popcorn on his diet according to his website- he forbids all starchy vegetables. He even forbids quinoa. Whole grains are a great source of fiber. Also, the latest Harvard study on weight gain showed that whole grains actually inhibit weight gain- meat promotes it. Possibly the problem with grains is not that they are grains, but a lot of them are genetically modified. Of course processed grains are not good. He is quasi Taubesian. But it is good that he does disagree with Taubes about exercise contributing to weight loss. He also doesn’t seem to emphasize eating fatty meats as Taubes does, but rather lean proteins. The main source of fat in my diet is nuts- and no animal fat or meat of any kind. Bailor does emphasize nuts and seeds, which is good. I do believe that animal fat, processed fats and processed carbs can contribute to weight gain, but not the carbs from whole grains, or the fat from nuts and seeds. I won’t eat fish, but it may also not contribute to weight gain. It is also good that he accommodates Vegans and Vegetarians.

    • Phil

      Dan, as Phinney and Volek note in the intro of “The Art and Science of Low-Carb Living” (intro and first 2 chaps available at

      “Who doesn’t stand to benefit from a low carbohydrate diet? If you happen to be among the approximately 1 in 4 adults who will be blessed with the ability to thrive for a life-time on a low fat diet, consider yourself fortunate. The diet we describe here may not be appropriate for you personally, but that does not absolve you from understanding its benefits for your patients. In addition, those of us who do remain thin and healthy on a high carbohydrate diet still pay for the ill-health and lost productivity of the many who are poorly served (literally) by the ‘high carb low fat’ message. And while you may be metabolically blessed in being able to tolerate lots of carbohydrate now, that doesn’t guarantee that this will continue as you age. It just means that you currently have more diet options than those of us with carbohydrate intolerance.”

      Things would be far simpler if all needed a low-carb diet, but that is not the case. Also, needs may change over time: many children who had no problem with a high-carb diet had problems as an adult or as they got older. It is not meaningful to extrapolate from your personal experience; many eating your exact diet cannot possibly get your results. You may also drop out of that 1/4 of the population as you get older.

      • Dan

        That is good you don’t say that carbs make everyone fat, but rather that many could benefit from a low carb diet. I have maintained a 95 pound weight without being low carb, low calorie or low fat. I do eat 4 ounces of nuts each day which certainly are not low fat. Instead, I exercise everyday and have some upper limit on calories- a bit over 3000 calories. I do calorie balancing but not restriction.

  3. TheBumbler

    His recommendations are pretty much in line with what I found for myself. I’ve been maintaining a 70lb loss for about five years now.

  4. Spectra

    I’ve known for a very, very long time that the Food Pyramid is total crap. It was designed by the USDA to get people to buy more grain/starch/carb products under the guise that those foods are “nutritious”. I eat maybe 2 servings of carbs a day; not the 6-11 the USDA recommends. And I really do think there’s something to the fact that it isn’t just calories that count; it’s the type of food you eat. I eat a lot of calories in the form of nuts, fruits, veggies, eggs, meats, fish, and healthy fats, but I am very slim. Plus, I’m never hungry like I was when I was eating fewer calories of more processed foods. I’d like to read a copy of this book–sounds interesting.

    • Jim

      You’re so right. And the comment above “Being healthy is bad for big business.” shows how confusing nutrition is. Find your own way, and make the best use of books like the one reviewed.

    • SmoledMan

      I think the key thing is whole foods. As long as you avoid processed foods, you’re doing good. That and daily exercise!

      • Dan

        I love that combination of whole foods and exercise!

      • Jim

        Which means that really the entire supplement industry is a crock.

  5. Joe Cannon MS CSCS

    I’m very glad I found your website. I do have a question maybe the RDs can help answer. The point about “diet can improve hormone levels” was mentioned. Can any of the RDs provide me with published peer reviewed proof that a healthy diet improves (up regulates) chronic hormones levels in humans.

    I’m very open to the possibility that my assumption that this cannot be is incorrect. Just looking for some insights on this.

    • Ted Kallmyer

      There are numerous studies that show diet influences hormones I just did a quick search here 🙂

    • Nicole German (RD, LD)

      Hi Joe,
      This was not my point being made. This was in the book. However, we use nutrition therapy to improve all types of hormone-related conditions. To give a few examples: PCOS, Diabetes, low testosterone, post menopause etc. Many times, this is done to manage the symptoms better. Another great example is using nutrition therapy to improve hypothyroidism. Certain foods like soy/iodine can interfere. Most of the research that explains this are animal models or shows interference with medication in human studies. Other research shows that the un-medicated, more mild cases, nutrition therapy doesn’t matter as much.
      Anyway, here is one study that is just OK:
      There are others you can research as well.