|Believe it or not, but the question "low or high carb for breakfast" is non-sense, because there is no general answer. It depends on who is asking and what he is going to spend the rest of his day.|
If you google "breakfast" and "obesity" you're served a colorful potpourri of "pro breakfast" articles which will inform you about "facts" like "Eating a big breakfast fights obesity and disease" (ScienceDaily), or "Breakfast Combats Obesity and Diabetes in Young People" (medscape).
Could all these "experts" be wrong? For the obedient average Joe this sounds crazy. Like one of those theories from your average Internet conspiracy theorist, but if you look at the actual evidence you have to admit:"A definitive conclusion can be made concerning the role of breakfast skipping in weight change." (McCrory. 2014)
The reasons for our cluelessness are manifold
There is for example a very good reason I anteceded this article with a definition of "breakfast". The latter is after all something you won't find in the average study, which could therefore consider eating a donut at 11am in as much as "breakfast", as it would discard having a protein shake immediately after you wake up as "not breakfast".
If we look at the actual "average Joe" (according to US National survey data), we're getting into even more trouble. This guy was eating 2.76 meals in 1971–75, while he is now up to 2.96 in 1999–2002 (Kant. 2007).
In other words: Americans eat more frequently these days, but are still fatter
Obviously frequency alone doesn't tell us whether one of those "almost three" meals was actually the holy breakfast. I mean, if it wasn't it's obvious the Americans became fatter and fatter - right (sarcasm)? The data we are interested in, is thus not the total number of meal (if you want to know more about that, take a look at "Many Small Meals Suck!" | go for it!). The data we are interested in is the data in Figure 1, the number of non-obedient US citizens who don't listen to the well-meant advice from the USDA and simply skip one of their holy meals.
|Figure 1: Prevalence of skipping meals (breakfast, lunch, dinner) and snacking in the US, 2009–10 (McCory. 2014).|
|Figure 2: Prevalence of breakfast skipping among US men and women (USDA)|
USDA shows a slight decrease in the prevalence of breakfast skippingin both men and women by about 4%. If not having breakfast was the root cause of the obesity epidemic, the average American should thus have lost a few pounds over the past decade - right?
Right! This should be the case if breakfast was the mythical "lean-maker" the "experts" want us to believe. The figures, i.e. the constantly increasing rate of obesity, don't disprove that (those who don't eat breakfast could simply gain even more weight), but they certainly put another "?" behind the statement that having breakfast has anti-obesogenic effects.
23% of males and 20% of females skip lunch!
Apropos "?", I am missing one, here! One behind the consequences of skipping lunch. With all the upheaval about skipping breakfast, people seem to have forgotten that lunch, not breakfast, was the most commonly skipped meal among most age groups in 2009–10. In most age groups, 23% of males and 20% of females are skipping this important (?) meal... and are - you bet - having an unhealthy snack later in the afternoon.
How careless is it not to have breakfast :-) According to the latest meta-analysis of cross-sectional studies (epidemiology) with the telling title "Belief beyond the evidence: using the proposed effect of breakfast on obesity to show 2 practices that distort scientific evidence." skipping breakfast is associated with a +55% increased obesity risk. A risk increase without any evidence of a causal relationship between the two epidemiologically assessed parameters.Anyway! This is the breakfast skipping research summary and no afford to dig up the two or three studies that dealt with skipping lunch explicitly. Let's thus, just for the time being, assume breakfast does in fact keep you lean. How on earth would eating some extra-food do that, when we all agree that the root cause of the obesity epidemic is after all the ravenousness of the average Westerner and the ways in which his / her diet multiplies these effects...oh, I guess the latter will lead us right to one of the answer to our question.
Proposed reasons for the anti-obesity effects of breakfast
I am not sure if I will be able to list all of them, but the following list of explanations that have been brought forward to explain the cross-sectionally observed negative association between body weight and breakfast eating is probably pretty comprehensive:
- skipping breakfast leads to lower satiety than if breakfast had been eaten, thus
- overeating will ensue later in the day, which
- over time would result in weight gain
"in which breakfast skipping could result in no weight change over time, if breakfast skipping does not lead to overeating (i.e., if there is perfect compensation for the missed meal), or to weight loss if there is lack of compensation." (McCrory. 2014)In his review McCory provides an enlightening overview of each of these possible scenarios, I don't want to keep from you. The“control” in this imaginary case study is a habitual breakfast eater with energy needs of 2000kcal/day, whose energy intake distribution across breakfast, lunch, snacks and dinner is 2000 kcal/day and therefore who is maintaining body weight.
|Figure 3: Theoretical models illustrating different types of breakfast skippers vs. a habitual breakfast eater (McCrory. 2014).|
- Acute feeding studies on breakfast skipping effects on energy intake and appetite later in the day show equivocal results.
- Longer-term (2–3 weeks) randomized controlled trials do not show effects of breakfast skipping on weight change.
- In prospective studies with 3.7–10 years follow-up, individuals who consume breakfast more frequently gain less weight.
- Brown, Andrew W., Michelle M. Bohan Brown, and David B. Allison. "Belief beyond the evidence: using the proposed effect of breakfast on obesity to show 2 practices that distort scientific evidence." The American journal of clinical nutrition 98.5 (2013): 1298-1308.
- Kant, Ashima K., and Barry I. Graubard. "Secular trends in the association of socio-economic position with self-reported dietary attributes and biomarkers in the US population: National Health and Nutrition Examination Survey (NHANES) 1971–1975 to NHANES 1999–2002." Public health nutrition 10.02 (2007): 158-167.
- McCrory, Megan A. "Meal skipping and variables related to energy balance in adults: A brief review, with emphasis on the breakfast meal." Physiology & Behavior (2014).