A modified “fat before carbs” diet has me blasting past Batman. But, will my extreme fat-loading work for the marathon?

Pick your jaw up off the ground, you read my headline correctly. I’m about to kick off the “fat-loading” phase of my two-week endurance sport nutrition plan. For the next 10 days, I will be purposefully eating foods rich in high-quality fats in preparation for optimal performance at the Dallas Marathon. I’ve blogged here and at several other sites, including the Tabata Times, about this new “fats before carbs” pre-race fueling practice that is being endorsed by many cutting-edge sports nutritionists. Please check out these posts, because I list some sample menu plans. Now, before you start clucking your tongue and waving your finger, know that I won’t be scarfing down pints of Haagen-Dazs and baskets of chili-cheese fries. I’m not planning on weight gain, moving into my yoga pants 24/7, or getting gunked up with harmful trans-fats. But,  65 percent (that’s not a typo!!!) of my daily caloric intake for the next 10 days will come from high-quality fat sources, including healthy oils, nuts, meats, avocados, whole milk, cheese, eggs, and fatty fish fats — in a greater ratio than I normally eat. I currently consume about 30 – 40 percent fat in my diet, so this will be a noticeable change. Based on my average, 2500 calorie a day diet, I estimate that I will be eating 16,250 calories from fat over the next 10 days (or 180 grams per day – is this even possible?) Not sure, but I’m ready to try!

An example diet that includes good fat-loading choices on left. Good carb-loading choices on right.

So, why am I feasting on fat in order to run a faster marathon? During this fat-loading phase, I will be training my body to better tap fat stores as a more immediate source of fuel, which will hopefully spare my glycogen reserves to be called upon during the later miles of the race – in other words, it will hopefully prevent me from “bonking” or “hitting the wall” as early as I do (which is typically around 20 miles for me and most other people). With all this fat and comparatively so little carbohydrate, I admittedly might feel a little sluggish for the next week and a half of training. But, since I am in taper phase and my mileage and speed have been reduced, I don’t expect to suffer too greatly in the process.

There may be bacon involved, just sayin’.

The flip side of this somewhat extreme nutrition plan is that in the last three days prior to the marathon, I will switch from a high-fat diet to a high-carbohydrate diet. The high-carb phase of the plan is pretty similar to the traditional “carbo-loading” that endurance athletes have embraced for years! Seventy percent of my calories will come from high-quality carbohydrates (including whole grains, fruits, and vegetables) to ensure that my glycogen tanks are as topped off as possibly on marathon morning. The expected outcome is that I’ll feel perky, peppy and ready to race — and have enough glycogen stored and held onto as a “reserve tank” to see me to the finish line.

Planning my menu for the next couple weeks will be like solving a culinary algebraic equation, but a fun challenge — I am a food nerd, after all! Before it’s all said and done, I’m sure that I’ll have downed a couple dozen eggs, a couple quarts of guacamole, some salmon and at least a couple of prime steaks with all that sought-after (and actually good-for-you) fat marbling. But, do I have to give up my daily salad? While a bunch of lettuce is definitely not high in fat, I’m going to keep on eating my beloved spring lettuce mix because it’s a healthy habit I crave and, in the scheme of things, a plate of lettuce makes virtually no dent in my daily calorie allowance. However, I’ll be dressing it with some extra olive oil to reach that 65% fat goal. So, please come back to TheFitFork.com  in the next few weeks, I’ll  be sharing some new recipes I have been pinning and tearing out of magazines for inspiration – of course, I’ll be tweaking them with my own personal spin.  Right now, these three recipes are on my immediate to-do list for healthy high-fat feasting:

This is my famous breakfast hash — I’ll make it without the sweet potatoes this week.

From FitSugar.com – Baked Avocado Eggs

From Cook’s Illustrated: Vaca Frita, yeah — that’s right – Fried Cow!