Fatigue on a GLP-1 can feel like hitting a wall — even simple tasks require more effort than they should. Brain fog, physical exhaustion, struggling through workouts.
Why this happens
You're eating significantly less — when your calorie intake drops, your body has less fuel.
Your blood sugar may be running lower — if it drops too low or fluctuates, you'll feel tired, shaky, or foggy.
Dehydration and electrolyte imbalance — if you're not drinking enough, your energy tanks.
Muscle loss — if you're losing weight quickly without adequate protein, you may be losing muscle mass.
What might be causing yours
"I'm tired all the time, no matter how much I sleep"
→ Often points to inadequate calories, protein, or nutrients. Track what you're actually eating.
"I feel weak or shaky, especially between meals"
→ This can be a blood sugar issue. Small amounts of protein regularly helps.
"My brain feels foggy — I can't focus"
→ Often related to hydration, electrolytes, or not enough healthy fats.
"I used to have energy, but it's gotten worse over time"
→ Often indicates nutrient depletion. Get blood work — B12, iron, vitamin D.
What's actually helping people
Protein
Getting enough protein is nearly impossible through food alone when you can barely eat. Target: 80-100g daily. Optimum Nutrition Gold Standard Whey delivers 24g per scoop and mixes easily into shakes.
B Vitamins
B vitamins are essential for cellular energy production. Thorne B-Complex uses active forms that are better absorbed, supporting both energy and brain function.
Iron (if deficient)
Low ferritin causes crushing fatigue. Get tested first — ferritin should be 50-70, not just "normal" at 15-20. Thorne Iron Bisglycinate is gentle on the stomach and highly absorbable.
Electrolytes
LMNT Electrolytes first thing in the morning or when energy crashes. Even drinking water doesn't help if you're missing sodium, potassium, and magnesium. No sugar, clean ingredients.
What else helps
- •Prioritize protein at every meal — even if it's just a few bites
- •Don't skip meals — eating small amounts regularly keeps energy stable
- •Include healthy fats — avocado, nuts, olive oil
- •Track your intake for a few days — you might be shocked
The bottom line
Track what you're actually eating for a few days. B-complex, iron (if deficient), and electrolytes address the most common causes.
