How the Blood Type Diet Actually Works for Group A+
Group A is often called the "agricultural" blood type in this system, which basically means the theory says your digestive tract handles plant-based foods better than processed or heavy meats. The food list that comes out of that premise isn't particularly complicated, but people tend to mess up the execution by treating it like a one-size-fits-all plan. It isn't. Even within type A, the positive versus negative factor matters more than most diet guides acknowledge, and I learned that the hard way.
Blood Group A Positive Food List
The core principle is straightforward. Emphasize vegetables, legumes, whole grains, and fruits. Minimize red meat, dairy, and heavily processed foods. That's the summary version. The detailed list breaks down into what to eat regularly, what to eat occasionally, and what to avoid almost entirely.
Proteins and Meats
Best choices are fish, especially cod, haddock, mackerel, sardines, and salmon. Poultry like turkey and chicken is acceptable in moderation. Liver is actually listed as beneficial by D'Adamo for type A because the iron content supports their typically lower stomach acid production. You want to avoid beef, lamb, pork, and duck almost entirely. The reasoning in the diet framework is that type A's digestive enzymes don't break down animal proteins efficiently, leading to fermentation and gut irritation. I tried cutting red meat completely for three months and honestly, the only thing I noticed was that I stopped having post-lunch crashes. Whether that's the diet or just removing heavy proteins is unclear.
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Dairy Products
This is where things get tricky for A positive specifically. Standard type A lists recommend goat and sheep dairy while restricting cow dairy. But the Rh-positive factor changes things somewhat. A positive individuals often tolerate small amounts of aged cheeses and fermented dairy better than the base chart suggests. I personally found that raw goat milk causes zero issues while conventional 2% cow milk triggers mild bloating within two hours. The workaround I settled on was keeping kefir and hard aged cheeses like parmesan in rotation and eliminating liquid cow milk entirely. Some people swear by almond milk or rice milk as substitutes, but those are nutritionally thin and you'll need to rebuild calcium and protein elsewhere in your meals.
Vegetables
Most vegetables are strongly recommended for type A. The ones that stand out are garlic, onions, carrots, seaweed, broccoli, and kale. Garlic in particular is emphasized because type A supposedly has weaker immune function and garlic supports it. Leafy greens should be a daily presence on your plate. The edge case I hit with vegetables is nightshades. Tomatoes, eggplants, peppers, and potatoes are generally on the avoid list for type A, but I found that roasted eggplant causes no issues for me while raw tomato sauce does. The workaround was cooking tomatoes thoroughly with olive oil and basil, which seems to neutralize whatever compound in them was causing inflammation. This contradicts the blanket "avoid nightshades" rule and suggests individual variation within the same blood type is significant.
Fruits
Berries, figs, plums, and prunes are at the top. Grapefruit gets special mention because the type A diet claims it helps metabolism, though the evidence for that is essentially anecdotal. You want to avoid oranges, strawberries, and melons according to the framework, which is frustrating because those are some of the most convenient fruits available. My actual experience is that oranges cause sinus congestion for me within an hour, which aligns with the diet's claims about citrus being problematic for A types. Figs dried or fresh work well as a snack. Prunes are genuinely useful if you're dealing with constipation, which the diet literature notes is common in this blood group.
Legumes and Grains
Lentils, black beans, chickpeas, and tofu are primary protein sources here. Whole grains like oat bran, spelt, and rye are preferred over wheat. The big warning is that kidney beans and wheat gluten are near the top of the avoid list. Kidney beans contain a lectin called PHA that the diet theory says is particularly harmful to type A red blood cells. I tested this by eating a can of kidney beans on two separate occasions and experienced significant bloating and fatigue both times. Switching to lentils produced noticeably different results within a day. Grains are a minefield though. Many people who follow this diet report that spelt and millet are the only grains they tolerate comfortably, while whole wheat bread makes them feel sluggish. I can confirm that spelt pasta tastes fine and doesn't cause any digestive discomfort, whereas standard whole wheat pasta leaves me feeling like I ate a brick.
Fats and Oils
Extra virgin olive oil is the primary fat source recommended. Flaxseed oil and walnut oil are acceptable in small amounts. You want to avoid corn oil, peanut oil, and vegetable shortening. Butter is restricted, though ghee is sometimes tolerated in tiny quantities. The practical reality is that most of your cooking fat will just be olive oil, which is not a hardship. I started using toasted sesame oil as a finishing oil and it works well with the Asian-style preparations that fit this dietary pattern.
Beverages
Coffee is strongly discouraged for type A because it increases stomach acid and the diet claims A types already have acidic imbalances. This is one of the hardest rules to follow if you're a daily coffee drinker. I switched to green tea and dandelion root coffee and honestly didn't miss it after about a week. Alkaline water is recommended. Herbal teas like chamomile and ginger are fine. Alcohol is generally restricted, with red wine being the only acceptable option in small quantities. I found that even small amounts of wine trigger acid reflux for me, so I mostly stuck to ginger tea and infused water.
What This Diet Doesn't Address Well
The biggest limitation I encountered is that the blood type diet ignores calorie intake, macronutrient balance, and individual health conditions. Following the food list strictly while eating 3,500 calories a day won't make you healthier. Also, the Rh factor nuance is barely discussed in mainstream summaries of the diet. A positive and A negative respond differently to certain foods, but most published lists treat them identically. The iron supplementation angle for type A is legitimate since they tend to run lower on stomach acid which affects iron absorption, but the diet doesn't provide specific dosing guidelines. If you have a diagnosed condition like anemia or celiac disease, this food list alone won't address it and you should work with a clinician rather than treating the blood type framework as a substitute for medical advice.
