Posted by Mark Nessim
If you've started Ozempic, Wegovy, or another GLP-1 medication, you've likely experienced at least one of the common side effects: nausea, fatigue, digestive discomfort, or that persistent brain fog that makes it hard to focus. These side effects are real, they're common, and most people work through them without realising how much of what they eat affects how manageable they feel.
This article is general nutrition information, not medical advice. Side effects, dosing and whether a medication suits you are conversations for your prescribing clinician.
Why GLP-1 Medications Cause Side Effects
GLP-1 receptor agonists work by slowing gastric emptying — the rate at which food moves from your stomach to your small intestine. This is part of why they're so effective at reducing appetite and controlling blood sugar. But it's also the root cause of most side effects.
When food sits in your stomach longer than usual:
- Nausea becomes more likely, especially after eating too much or too fast
- Bloating and gas increase
- Certain foods that were previously well-tolerated can suddenly feel uncomfortable
- Energy levels can drop because nutrient absorption timing is disrupted
Add in the calorie restriction that naturally follows appetite suppression, and many GLP-1 users find themselves running low on the key nutrients that support energy, mood, and cognitive function.
The Most Common GLP-1 Side Effects and What Helps
Nausea
Nausea is the most reported side effect, especially in the first few weeks of treatment or after a dose increase. Nutritionally, this is often made worse by eating large meals, high-fat foods, or foods that are difficult to digest.
What helps:
- Eat smaller, more frequent meals
- Avoid greasy or fried foods during peak nausea periods
- Prioritize easily digestible protein sources — liquid protein shakes are often much better tolerated than solid food
- Ginger (in tea or supplement form) has evidence supporting its anti-nausea effects
Fatigue and Low Energy
Many GLP-1 users report significant fatigue, especially in the first month. This is largely driven by reduced calorie intake and, critically, inadequate protein consumption. When your body isn't getting enough protein, it starts breaking down muscle for energy — which compounds fatigue and creates a downward spiral.
What helps:
- Prioritize protein at every meal, even small ones (how to work out your own number)
- B vitamins — particularly B12 — support energy metabolism and are often depleted when food intake drops significantly
- Avoid relying on caffeine as a primary energy source; it can worsen nausea and disrupt sleep
Brain Fog
Cognitive sluggishness is a frequently reported but rarely discussed experience during GLP-1 therapy. It's likely related to a combination of calorie restriction, disrupted sleep (common during the adjustment period), and reduced intake of nutrients that support normal cognitive function.
What helps:
- Omega-3 fatty acids (EPA and DHA) support cognitive function
- Adequate protein provides the amino acid precursors for neurotransmitters like dopamine and serotonin
- Consistent hydration — dehydration measurably worsens cognitive performance
Digestive Discomfort and Bloating
Slowed gastric motility means food ferments longer in your gut, feeding gas-producing bacteria and causing bloating and discomfort.
What helps:
- Sugar alcohols (sorbitol, maltitol, xylitol, erythritol) are a frequent and overlooked cause — they ferment readily, and a slowed gut gives them longer to do it
- Probiotics support gut microbiome balance, which is often disrupted during rapid dietary changes
- Avoid carbonated beverages and high-FODMAP foods during flare-ups
Why Most People Don't Connect Nutrition to How They Feel
The standard advice is to eat smaller meals, avoid fatty foods, and wait for your body to adjust. That's valid — but it's incomplete. What's missing is the recognition that eating far less food creates specific nutritional gaps, and those gaps have their own consequences for energy, muscle and general wellbeing.
The people who get through this period best aren't just eating less — they're eating deliberately. They're getting enough protein even when they're not hungry, supporting gut health proactively, and paying attention to the nutrients that reduced food intake inevitably thins out.
Where ASP-1 Fits
ASP-1 by Habthera was formulated for people taking GLP-1 medications, who are typically eating a good deal less than they used to. One scoop delivers 25 g of total protein — 20 g whey isolate plus 5 g collagen peptides — in a small, easily tolerated serving, alongside 3 g of creatine monohydrate, magnesium, zinc, methylated B-12, a prebiotic fibre and a spore-form probiotic. (Every dose is on the supplement facts panel.)
To be clear about what that is and isn't: it is a way to keep protein and micronutrient intake adequate while you are eating less. It does not act on your medication, it does not treat side effects, and it is not a substitute for anything your clinician has told you. It's a protein powder built for people in this situation rather than repurposed for them.
If you are early in this, the GLP-1 Starter Guide covers the wider picture, and we go deeper on the protein side in how to get enough protein when you have no appetite.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
