Evidence of a pullback in consumer spending is growing, with retail bellwether Walmart Inc WMT.N expecting its annual earnings to decline as much as 13%, as surging prices of food and fuel prompt customers to cut back on discretionary purchases. Adds background, net income July 27 (Reuters) - Canadian retail group Loblaw Cos Ltd L.TO reported quarterly revenue below estimates on Wednesday as high inflation forces consumers to rein in discretionary spending. Analysts on average were expecting revenue of C$12.98 billion, according to IBES data from Refinitiv.