“What percentage of my diet should be carbs? What about fat? and how much protein do I need?” I get this question all the time and usually give the same answer: do you really want to think about that every day? The point is, even as a dietitian who is somewhat good in math I would never want to calculate these figures on a daily basis. Even using an app. But many people are confused about this, they hear things at the gym, their marathon running friends are carb loading, or maybe they saw a magazine headline at the grocery store check out. Not to mention goals of losing weight, which usually are part of the motivation to find the best combo of macronutrients that could be the magic answer.
As far as recommendations that would provide a “balanced” diet here is the general guide:
Carbs: 45-65% Fat: 20-35% Protein: 10-35%
Many are surprised that our diets should be at least half carbohydrates, with all the low carb diets out there, it may not make sense. Remember, everyone is different and it is important to consider your own health history, metabolism and body. There are some patients I have worked with who respond differently to carbohydrates (such as those with PCOS or polycystic ovarian syndrome) and balancing carbs with protein is important to prevent increases in insulin. And for the average person who wants to maintain a certain level of blood glucose, including protein in a meal definitely helps. It is more about balance and less about avoidance or restricting.
But what if you really did want to figure out what percentage of your diet is protein for example? I do know people who eat a lot of protein thinking it will help them build muscle (just yesterday at lunch a young twenty-something year old teacher had two bunless cheeseburgers on his plate….nothing else). You first would need to know the total amount of calories you ate in a day (nothing I would ever recommend doing, but just to demonstrate how ridiculous and irritating it would be), let’s use 2000 calories as an example.Then 10% of this would be 200 calories. That means 200 calories as a minimum should come from protein. Since protein has 4 calories per gram, that means 200 divided by 4 is 50. So the answer is 50 grams of protein is 10 percent of calories from protein in a 2000 calorie diet. An ounce of meat has 7 grams of protein, so 7 ounces of meat would just about meet the 50 grams. But protein also comes from other foods, even cereals and grains, dairy, beans, nuts and pasta have some protein. See why it would not be too fun to try to figure out? Even for one day, pretty irritating. So what should you do if you want to eat a healthy balanced diet?
I did do a brief review of the research regarding macronutrients and health as well as weight. To put it simply, I could not find any new breaking news regarding macronutrients and weight. Low glycemic index diets do not result in more weight loss as far as current research (that means low carb). The one macronutrient mentioned as affecting both health and weight was fiber. There were several studies that suggested a high fiber diet was beneficial for both health and weight. This means more fruits, veggies and whole grains. Now that is not exactly a newsflash, but does reinforce a “health” approach to eating verses a “weight loss” approach or trying to limit a certain food group. That is why the government came up with the simple “My Plate” illustrating half the plate as “colors”, or fruits and vegetables, a quarter of the plate whole grains and a quarter of the plate protein food, as well as dairy on the side. The message I like to send is variety, not restriction. I don’t think it is “dieting” to try to add more fruits and vegetables to your meals. If you throw strawberries in your salad or an apple in your lunch bag, it makes sense because you enjoy them. This kind of move toward healthier eating does not seem stressful to me. It does not take too much thinking (too much thinking about eating is not health promoting, and tends to add stress which is NOT good for health). If you don’t take the My Plate idea too far (you don’t have to have the perfect plate every meal), then it is a good general and simple guide.
If you are interested in more specifics regarding dietary recommendations, see Dietary Reference Intakes however please keep in mind we all have different needs, and not everyone eats or needs exactly the same amount of a nutrient. These are general recommendations.
The Academy of Nutrition and Dietetics also has a position paper (2002) on the topic called Total Diet Approach. Although it mentions the outdated Food Pyramid it also describes a way of eating where “all foods can fit” and again, stresses the importance of focusing on health without trying to be perfect. If you like a food, any food, you need to fit it in. It is the average intake of nutrients over an entire week for instance that matters. So even if you eat twinkies for all three meals one day, it does not matter….over time.
Bottom line: keep it simple. Learn from listening to your own body. Good old boring common sense…….
I was at a lovely outdoor graduation party yesterday and happened to walk in on a conversation that was going on between a sweet young man in his 20’s and my husband. “She’s a dietitian, you should ask her”. Apparently, this healthy-looking but thin young man was trying to gain weight. He had been a runner in high school, now worked out but not as much, sharing that when he was lifting he was able to put on some weight. I went into my spiel about “listening to your body”, explaining how our natural set-point makes it difficult to change (our genetics) and that even if he tried to eat more or add protein shakes (what he has tried in the past), it would be hard to maintain due to the fact that it requires way too much thinking and also, just as with dieting, your body tends to compensate and do what it needs to so you will go back to where you are supposed to be. “But what should he eat? He doesn’t know!” my husband says. I looked at this guy and he says “he’s right, I don’t really know”. Oy. How did eating become so complicated for even a twenty-something year old male? I kind of understand, it makes sense that women, especially older women who have spent a life time dieting and not being happy with their bodies continue to try one diet after another, end up on and off restricting and overeating, but this just felt odd to me. I just wanted to say “Just eat what you want!” It struck me at that moment that people who don’t know much about nutrition and really do care about their health (and body size, which always seems to be the motivating factor to look into nutrition) really don’t know where to begin.
The other day another co-worker emailed me a link to her new eating plan. She wanted my opinion. This is where it gets hard for me, because I just want to say “please don’t waste your time or money” but that is not what I said. As a dietitian who has researched dieting, and wrote my Master’s Thesis on restrained eating back in 1996 I clearly remember how blown away I was by the proof I found about the failure of dieting, feeling outraged that this never made headlines. Well, now, when people talk about dieting, I keep my mouth shut……at first. I have learned that people will tune you out if you hit them all at once with the truth. I have learned that most dieters are very hopeful and truly think they can do it “this time”. Instead, I share my experience with my patients. So I may say “can I tell you what I have seen happen?” If they say “yes” that opens the door. I warn of “all-or-nothing” thinking, how going “on” something means you eventually will go “off”. And on and on and on.
I like to share the most recent news regarding anything to do with weight loss or dieting. Every month I receive the Journal of the Academy of Nutrition and Dietetics (AND) which used to be the American Dietetic Association (ADA). It was hard for me to get used to the new name as I am an older dietitian and for a few decades it has been ADA to me. Anyway, the journal always comes because I pay my fees and it has lots of articles, mostly research (not always interesting to me, I have to admit). But I just love when they publish a new Position Paper because many dietitians have reviewed years of research (not the most fun thing to do) and then let us know how we should do our job. As a Registered Dietitian, I don’t have time to do that ( FYI a Registered Dietitian is an RD or RDN, Registered Dietitian Nutritionist, a newer designation I think recently added because people like the word “nutritionist” better than dietitian, and anyone, yes anyone, can call themselves a nutritionist, but only those of us who have gone through 4 years of college as well as a clinical training or internship and then passing a national exam can then call ourselves a “dietitian”). So when you are seeking advice about nutrition you really need to talk to an RD or RDN.






