Runna Won't Tell You This: Why Most Runners Eat Backwards

Here's a pattern we see constantly: a runner finishes a tough 16km long run on Saturday morning, comes home exhausted, and has a light salad because they're "trying to lose weight." Then on Sunday — a rest day — they eat a massive brunch, snack all afternoon, and have a big dinner because they "earned it yesterday."

This is eating backwards. And if you're following a Runna training plan, it's probably happening to you.

Research from the British Journal of Sports Medicine shows that recreational endurance athletes consume nearly identical calories on rest days and heavy training days — despite energy expenditure differences of 500 to 1,500 calories. The result? They're underfueled when it matters most (workout days) and overfueled when it matters least (rest days).

Think about what this means for your body. On your hardest Runna session of the week — the one that drives your fitness gains — your muscles are running on fumes. Glycogen stores are half-empty. Recovery is compromised. And on your rest day, when your body needs minimal fuel, you're storing excess calories as fat.

You're literally working against yourself.

It's not stupidity — it's human nature combined with bad advice.

• Appetite suppression after hard exercise: High-intensity workouts temporarily suppress ghrelin (the hunger hormone). You finish a hard run and don't feel hungry — so you eat less.
• Delayed hunger on rest days: The body upregulates appetite 12-24 hours after a hard session. That's why you're ravenous on Sunday after Saturday's long run.
• Calorie tracking apps that set one daily target: MyFitnessPal gives you the same 2,000 calories whether you ran 20km or sat on the couch. This trains you to eat the same every day.
• Diet culture guilt: Runners who want to lean out feel guilty eating a lot on workout days. They restrict when they should be fueling.

Underfueling isn't just about feeling tired. It has cascading effects on your training:

• Incomplete glycogen recovery — you start your next hard session already depleted
• Elevated cortisol and stress hormones — increases injury risk and slows adaptation
• Impaired protein synthesis — your muscles don't rebuild as effectively
• Hormonal disruption — especially in female athletes (amenorrhea, bone stress fractures)
• Relative Energy Deficiency in Sport (RED-S) — a serious clinical condition affecting performance and health

A 2026 study in the International Journal of Sport Nutrition found that runners with low energy availability on training days had a 60% higher rate of bone stress injuries compared to those who fueled adequately — even when their weekly calorie intake was identical.

Read that again. Same total calories. Different distribution. Dramatically different injury rates.

Elite runners don't eat the same thing every day. They practice periodized nutrition — matching daily intake to daily training demand. It's the same principle as periodized training: you don't run the same distance at the same pace every day, so why would you eat the same?

Notice the pattern: carb intake tracks with training intensity and volume. Protein stays relatively stable. Fat fills the gap on lighter days.

Runna is a training plan app. It's outstanding at what it does — building progressive, adaptive running plans. But nutrition is outside its scope. Runna doesn't know what you ate, doesn't track your macros, and doesn't adjust your diet to match the workout it just prescribed you.

This isn't a criticism of Runna. It's a fundamental gap in how runners use technology. You have an app for your training plan. You have an app for tracking food. But nothing connects the two.

Until now.

MAVR connects to your Runna calendar and reads every workout on your plan. Then it does something no other nutrition app does: it adjusts your daily macro targets based on what you're training that day.

• Long run Saturday? MAVR increases your carb target and adds pre-run, during-run, and recovery meal recommendations.
• Rest day Sunday? MAVR dials back carbs and increases protein and fat to support recovery without excess.
• Double session Tuesday? MAVR increases your daily calories and suggests specific fueling windows between sessions.
• Taper week? MAVR maintains high carbs for glycogen loading while reducing overall volume-based calorie expenditure.

This is what periodized nutrition looks like in practice — and it happens automatically when your Runna calendar is connected.

Even without MAVR, you can start fixing this today:

• Rule 1: Eat more on hard days, less on easy days. Your biggest meals should surround your hardest sessions — not your rest days.
• Rule 2: Front-load your carbs. Eat carbs before and after training, not at night on your day off.
• Rule 3: Don't trust your appetite on workout days. Your hunger hormones are suppressed after hard exercise. Eat by plan, not by feel.