Medically reviewed by Mr Maneesh Ghei, Consultant Urological Surgeon (GMC: 5208045)

A kidney infection (pyelonephritis) is a serious urological condition that always requires antibiotic treatment. However, what you eat and drink can either support or hinder your recovery. Knowing which foods to avoid with a kidney infection can help reduce symptoms, avoid putting extra strain on the kidneys, and give antibiotics the best chance to work effectively.

Foods to Avoid With a Kidney Infection

High-Sodium Foods

Too much salt forces the body to retain water, raises blood pressure, and increases the workload on the kidneys. Common culprits include processed foods such as crisps, canned soups, ready meals, and savoury snacks. Even items that appear healthy — such as some breakfast cereals and salad dressings — can contain high sodium levels. Avoid adding extra salt to meals and opt for fresh ingredients flavoured with herbs and spices instead.

Excessive Protein

Protein metabolism produces waste products that the kidneys must filter. During a kidney infection, the kidneys are already under stress, so consuming very large amounts of protein can add to their burden. Red meats, poultry, and eggs should be eaten in moderation. Plant-based proteins such as lentils, chickpeas, and tofu are gentler alternatives during recovery.

Sugary Foods

Sugar promotes inflammation, which is unhelpful when fighting an infection. Common sources include sweets, cakes, pastries, fizzy drinks, and hidden sugars in condiments like ketchup and barbecue sauce. Fresh fruit is fine in moderate amounts. Avoid sugary drinks entirely during recovery.

Spicy and Acidic Foods

Spicy and acidic foods can irritate the urinary tract, worsening pain and discomfort. Common offenders include chillies, hot sauces, tomatoes, citrus fruits, and vinegar-based products. During recovery, plain and easily digestible meals such as boiled vegetables, plain rice, and mild soups are gentler on the system.

High-Oxalate Foods

Oxalates are naturally occurring compounds that can contribute to kidney stone formation, which can complicate recovery. Foods to limit include spinach, beetroot, rhubarb, and certain nuts.

Dairy Products in Large Amounts

Dairy is high in calcium and phosphorus, which can accumulate when the kidneys are not working optimally. Limiting large amounts of milk, cheese, and yoghurt during a kidney infection is sensible. Consider lower-phosphorus alternatives like oat milk if needed.

High-Potassium Foods

When kidney function is compromised, the body may struggle to regulate potassium levels. Foods high in potassium — such as bananas, oranges, potatoes, and avocados — should be consumed sparingly. Lower-potassium alternatives include apples, berries, cauliflower, and courgettes.

Drinks to Avoid With a Kidney Infection

Alcohol

Alcohol should be avoided entirely during a kidney infection. It dehydrates the body, suppresses immune function, and can interact poorly with antibiotics, reducing their effectiveness or causing side effects. Even small amounts can hinder the kidneys’ ability to fight the infection.

Caffeine

Caffeine is a diuretic, which means it increases urinary frequency and can contribute to dehydration. When fighting a kidney infection, staying well hydrated is essential — and caffeine works against this. Coffee, tea, energy drinks, and caffeinated soft drinks should be avoided or reduced significantly during recovery.

What to Drink Instead

Water is the best choice. Aim to drink enough so your urine is pale yellow and you are urinating regularly. This helps flush bacteria through the urinary tract and supports the kidneys in their work. Herbal teas and diluted, unsweetened fruit drinks are acceptable alternatives.

Lifestyle Tips During Recovery

• Rest: Allow your body time to heal by prioritising sleep and avoiding overexertion
• Complete your antibiotics: Take the full prescribed course even if you feel better before it ends
• Avoid smoking: Smoking reduces blood flow to the kidneys and slows healing
• Light movement when able: Short walks can improve circulation and support immune function without overloading the body

If you are in London and looking for specialist urology advice, Mr Maneesh Ghei offers private consultations at The Wellington Hospital, St John’s Wood. No GP referral is required and same-week appointments are usually available.

Frequently Asked Questions

Can diet alone treat a kidney infection?

No. Diet can support your recovery, but a kidney infection is a serious bacterial infection that requires antibiotic treatment. Without antibiotics, the infection can spread and cause serious complications including permanent kidney damage or sepsis. Always see a doctor promptly if you suspect a kidney infection.

What should I eat when I have a kidney infection?

Stick to plain, easily digestible foods during the worst of the infection: boiled or steamed vegetables, plain rice, porridge, and mild soups are all good choices. As you improve, gradually return to a normal balanced diet. The priority is staying well hydrated with water throughout recovery.

Is coffee bad for a kidney infection?

Yes, caffeine is best avoided during a kidney infection. It acts as a diuretic, which increases urination and can contribute to dehydration at a time when staying hydrated is critical. It can also irritate the bladder, worsening urinary symptoms. Switch to water or herbal teas until you have recovered.

Can I drink alcohol with a kidney infection?

No. Alcohol should be completely avoided during a kidney infection. It dehydrates the body, suppresses the immune system, and can interfere with antibiotics — potentially making them less effective or causing unpleasant side effects. Wait until you have completed your antibiotics and fully recovered before drinking alcohol again.

How much water should I drink with a kidney infection?

There is no fixed daily target, but aim to drink enough that your urine is pale yellow rather than dark. Most adults need around 6 to 8 glasses of water per day under normal circumstances; you may need more during a kidney infection. Sip water regularly throughout the day rather than drinking large amounts at once. Seek advice from your GP or urologist if you have any fluid restriction for another reason.

When should I see a urologist for a kidney infection?

See a urologist if your kidney infection is not improving after starting antibiotics, if symptoms recur after completing treatment, or if you get repeated kidney infections. A urologist can investigate whether there is an underlying cause such as kidney stones, a structural abnormality, or another factor making you more susceptible, and recommend a longer-term plan to reduce recurrence.

Where can I see a private urologist in London?

Mr Maneesh Ghei is a consultant urological surgeon based at The Wellington Hospital, Platinum Medical Centre, St John’s Wood, London NW8 7JA. He covers kidney infections, kidney stones, urinary problems, and a wide range of urological conditions. Same-week appointments are available with no GP referral needed.

About the Author

Mr Maneesh Ghei, Consultant Urological Surgeon (GMC: 5208045)

Mr Maneesh Ghei is a consultant urological surgeon with NHS and private practice across four London hospitals. He specialises in the diagnosis and management of kidney infections, urinary tract conditions, kidney stones, prostate conditions, and male sexual health. Mr Ghei sees new patients privately with same-week availability. No GP referral is required. Book a private urology consultation.